Wiegand line structure, manufacturing method of Wiegand line structure and Wiegand sensor

Abstract

The invention provides a Wiegand line structure, a manufacturing method of the Wiegand line structure and a Wiegand sensor. The Wiegand line structure includes: a metal wire; the magnetic layer is arranged on the periphery of the metal wire in a surrounding mode, and the material for forming the metal wire and the material for forming the magnetic layer are different magnetic materials. According to the application, the range of materials for manufacturing the Wiegand line structure is broadened, the design flexibility of the Wiegand line is further improved, complicated mechanical structure adjustment is not needed, a stress treatment process in the prior art is avoided, the process controllability of the Wiegand line is enhanced, the reliable and stable performance of the Wiegand line structure is determined, and the application range of the Wiegand line structure is widened. And the practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of Weigand sensors, and more particularly, to a Weigand wire structure, a manufacturing method of the Weigand wire structure, and a Weigand sensor. Background Art

[0002] A Weigand sensor generally consists of a ferromagnetic wire called a Weigand wire and a pickup coil. The former has the special property of switchable polarity, and the latter is wound around or near the Weigand wire to generate an electrical signal while collecting energy. The Weigand wire has uniaxial magnetic anisotropy along its length direction, which is an ideal magnetization configuration for generating the Weigand effect. The Weigand sensor mainly utilizes the large Barkhausen jumps that occur when a magnetic material with a bistable magnetization state switches its magnetic state. Along with the large Barkhausen jumps, the soft layer in the magnetic material switches its magnetization very quickly between antiparallel and parallel. Since this jump does not depend on the rate of change of the externally applied magnetic field, the Weigand sensor can generate a constant output signal independent of the rotational speed. Utilizing this property, Weigand sensors are widely used in fields such as magnetic field sensing, position detection, micro-energy harvesting, switches, encoders, and flow meters.

[0003] The basic aspects of Weigand sensing technology are its materials and manufacturing. The inner core and outer shell of the Weigand wire have different coercivities. The region with a low coercivity is called the soft layer, and the region with a high coercivity is called the hard layer. This core wire / shell wire structure has bistability. Among them, how to manufacture a magnetic material with a bistable magnetization state is one of the key technologies.

[0004] The magnetic structure required for a Weigand sensor can be manufactured using wire or thin film materials. In the prior art process of manufacturing a magnetic material with a bistable magnetization state, a process of applying appropriate stress to a wire of a certain composition is usually adopted to produce a Weigand wire. However, due to the limitations of the complex stress treatment process, so far, only a limited number of materials can be candidates for generating the Weigand effect.

[0005] In view of the above defects, the present application provides a Weigand wire structure, enabling the Weigand wire to achieve bistable magnetic properties in the wire. Summary of the Invention

[0006] The main object of the present invention is to provide a Weigand wire structure, a manufacturing method of the Weigand wire structure, and a Weigand sensor to solve the problem in the prior art that the Weigand wire is restricted by the complex stress treatment process.

[0007] To achieve the above object, according to one aspect of the present invention, a Weigand wire structure is provided, including: a metal wire; a magnetic layer, disposed around the outer periphery of the metal wire, and the material forming the metal wire and the material forming the magnetic layer are different magnetic materials.

[0008] Optionally, it further includes: an adhesion layer, which is disposed around the outer periphery of the wire, and the adhesion layer is located between the wire and the magnetic layer.

[0009] Optionally, it further includes: a protective layer, which is disposed around the outer periphery of the magnetic layer, and the magnetic layer is located between the wire and the protective layer.

[0010] Optionally, the wire and the magnetic layer have different coercive forces.

[0011] Optionally, the magnetic layer includes multiple layers, and the multiple magnetic layers are stacked and disposed around the outer periphery of the wire.

[0012] Optionally, the materials of the wire and the magnetic layer are independently selected from any one or more of cobalt iron vanadium alloy, nickel iron alloy, cobalt iron, nickel iron, and nickel.

[0013] Optionally, the materials of the adhesion layer and the protective layer are independently selected from any one or more of zinc, tin, chromium, titanium, and tantalum.

[0014] To achieve the above object, according to one aspect of the present invention, there is provided a method for manufacturing a Weigand wire structure as described above, including: providing a wire; forming a magnetic layer on the outer periphery of the wire so that the magnetic layer constitutes a cladding structure of the wire, and the materials of the wire and the magnetic layer are different.

[0015] Optionally, the magnetic layer is formed by electrodeposition. According to another aspect of the present invention, there is provided a Weigand sensor, including the Weigand wire structure as described above and an induction coil wound around the side of the magnetic layer of the Weigand wire structure away from the wire.

[0016] Applying the technical solution of the present invention, there is provided a Weigand wire structure, which includes a wire and a magnetic layer. Among them, the above magnetic layer can be disposed around the outer periphery of the wire, and the materials for forming the above wire and the magnetic layer are both magnetic materials. Further, since the magnetic material for forming the wire is different from the magnetic material for forming the magnetic layer, due to the different magnetic properties of different magnetic materials, the Weigand wire structure composed of the above wire and magnetic layer can have a bistable magnetization state. It can be seen that compared with the prior art, the material of the Weigand wire structure can be composed of at least two magnetic materials, thereby broadening the range of materials for manufacturing the Weigand wire structure and further enhancing the design flexibility of the Weigand wire. In addition, since the bistable magnetization state of the Weigand wire structure can be achieved through the magnetic materials of the wire and the magnetic layer, there is no need for complex mechanical structure adjustment, avoiding the stress treatment process in the prior art, enhancing the process controllability of the Weigand wire, ensuring that the performance of the Weigand wire structure is reliable and stable, and having high practicability. Description of the Drawings

[0017] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It shows a schematic diagram of a magnetization state of a Wiegand wire structure according to an embodiment of the present invention under the action of an external magnetic field;

[0019] Figure 2 It shows another schematic diagram of a magnetization state of a Wiegand wire structure according to an embodiment of the present invention under the action of an external magnetic field.

[0020] Among them, the above-mentioned drawings include the following reference numerals:

[0021] 1. Metal wire; 2. Magnetic layer; 3. Adhesion layer. Detailed implementation manners

[0022] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] As mentioned in the background art, the basic aspects of the Weigand sensing technology are its materials and manufacturing. The inner core and the outer shell of the Weigand wire have different coercivities. The region with a low coercivity is called the soft layer, and the region with a high coercivity is called the hard layer. This core / shell wire structure has a bistable state. Among them, how to manufacture a magnetic material with a bistable magnetization state is one of the key technologies. In the prior art process of manufacturing a magnetic material with a bistable magnetization state, a process of applying appropriate stress to a wire of a certain composition is usually adopted to produce a Weigand wire. However, limited by the complex stress treatment process, so far, only a limited number of materials can be candidates for generating the Weigand effect. To solve the above technical problems, the present application provides a Weigand wire structure, a manufacturing method of the Weigand wire structure, and a Weigand sensor.

[0026] According to one aspect of the present application, a Weigand wire structure is provided. The Weigand wire structure includes: a metal wire; a magnetic layer, which is disposed around the outer periphery of the metal wire, and the material forming the metal wire and the material forming the magnetic layer are different magnetic materials.

[0027] Specifically, the metal wire can be a magnetic wire capable of conducting electricity, and its diameter can be 0.25 mm to 0.35 mm. In some optional embodiments, the typical diameter of the metal wire used to make the Weigand wire can be 0.3 mm.

[0028] Specifically, the metal wire can have a preset extension length, so that the metal wire can have two end faces perpendicular to the extension length and a side surface located between the two end faces, and this side surface is the outer periphery of the metal wire. It can be understood that the above extension length can be reasonably selected according to the actual needs of those skilled in the art, and the application does not make specific limitations. Further, after providing the above metal wire, the outer periphery of the metal wire is completely exposed. In order to form a Weigand wire structure with a bistable magnetic state, a magnetic layer can be disposed around the outer periphery of the metal wire, so that the magnetic layer wraps the exposed outer periphery of the metal wire.

[0029] In the above embodiments, the Weigand wire structure includes a metal wire and a magnetic layer. Among them, the magnetic layer can be disposed around the outer periphery of the metal wire, and the materials forming the metal wire and the magnetic layer are both magnetic materials. Further, since the magnetic material forming the metal wire is different from the magnetic material forming the magnetic layer, due to the different magnetic properties of different magnetic materials, the Weigand wire structure composed of the metal wire and the magnetic layer can have a bistable magnetization state. It can be seen that compared with the prior art, the material of the Weigand wire structure can be composed of at least two magnetic materials, thereby broadening the range of materials for manufacturing the Weigand wire structure and further improving the design flexibility of the Weigand wire. In addition, since the bistable magnetization state of the Weigand wire structure can be achieved by the magnetic materials of the metal wire and the magnetic layer, complex mechanical structure adjustment is not required, the stress treatment process in the prior art is avoided, the process controllability of the Weigand wire is enhanced, and the performance of the Weigand wire structure is determined to be reliable and stable, with high practicability.

[0030] In some alternative embodiments, the Weigand wire structure may include a metal wire, a magnetic layer, and an adhesion layer. Among them, the adhesion layer is disposed around the outer periphery of the metal wire, and the magnetic layer is disposed around the outer periphery of the adhesion layer, so that the adhesion layer is located between the metal wire and the magnetic layer.

[0031] In the above embodiments, in order to enhance the bonding force between the metal wire and the magnetic layer, an adhesion layer is provided between the metal wire and the magnetic layer. By enhancing the adhesion force between the metal wire and the magnetic layer, the adhesion layer can promote the formation of the double-layer magnetic structure in the Weigand wire structure, thereby contributing to improving the stability and performance of the Weigand wire structure. It can be understood that since the metal wire and the magnetic layer in the Weigand wire structure are formed of different magnetic materials, the metal wire and the magnetic layer in the Weigand wire structure constitute the above double-layer magnetic structure. In addition, due to the presence of the adhesion layer in this embodiment, the magnetic layer disposed around the outer periphery of the metal wire can also be prevented from detaching from the metal wire. Therefore, a thicker magnetic layer can be formed on the outer periphery of the metal wire in this embodiment.

[0032] Specifically, when the extending direction of the above Weigand wire structure is the first direction, the Weigand wire structure has a first cross-sectional view in a direction perpendicular to the first direction. The metal wire, the adhesion layer, and the magnetic layer are arranged in concentric circles in the first cross-sectional view. The circle corresponding to the metal wire has a first diameter, the circle corresponding to the adhesion layer has a second diameter, and the circle corresponding to the magnetic layer has a third diameter. The first diameter is less than the second diameter, and the second diameter is less than the third diameter.

[0033] To ensure the durability and reliability of the Wiegand wire structure, in some alternative embodiments, the Wiegand wire structure may include a wire, a magnetic layer, and a protective layer. Among them, the magnetic layer is disposed around the outer periphery of the wire, and the protective layer is disposed around the outer periphery of the magnetic layer, so that the magnetic layer can be located between the wire and the protective layer.

[0034] In the above embodiment, in order to prevent the magnetic layer located on the outer periphery of the wire in the Wiegand wire structure from contacting the external environment and being oxidized or corroded, a protective layer is disposed around the outer periphery of the magnetic layer away from the wire in this embodiment, so that the protective layer covers the exposed surface of the magnetic layer located on the outer periphery of the wire to prevent unnecessary chemical reactions, thereby achieving the purpose of anti-oxidation and anti-corrosion and achieving the effect of maintaining the stability of the internal material properties of the Wiegand wire structure.

[0035] Similarly, in the case where the extending direction of the above Wiegand wire structure is the first direction, the Wiegand wire structure has a second cross-sectional view in a direction perpendicular to the first direction, and the wire, the magnetic layer, and the protective layer are arranged in concentric circles in the second cross-sectional view. Similarly, the circle corresponding to the wire may have a first diameter, the circle corresponding to the magnetic layer may have a third diameter, and the circle corresponding to the protective layer may have a fourth diameter, then the first diameter is less than the third diameter, and the third diameter is less than the fourth diameter.

[0036] In some alternative embodiments, the Wiegand wire structure may include a wire, an adhesion layer, a magnetic layer, and a protective layer. Among them, the adhesion layer is disposed around the outer periphery of the wire, the magnetic layer is disposed around the outer periphery of the adhesion layer, and the protective layer is disposed on the outer periphery of the magnetic layer, so that the adhesion layer is located between the metal layer and the magnetic layer, and the magnetic layer is located between the adhesion layer and the protective layer.

[0037] As can be seen from the above, on the basis that the adhesion layer can enhance the adhesion between the wire and the magnetic layer and the protective layer can include unnecessary chemical reactions of the magnetic layer, the above embodiments of the present application regard both the adhesion layer and the protective layer as partial structural layers in the Wiegand wire structure, so that the integration of the wire, the magnetic layer, the adhesion layer, and the protective layer is achieved in the same Wiegand wire structure, so that the Wiegand wire structure simultaneously achieves the effects of preventing the magnetic layer disposed around the outer periphery of the wire from detaching from the wire and being easily formed into a thicker magnetic layer, and anti-oxidation and anti-corrosion, and can maintain the stability of the internal material properties of the Wiegand wire structure.

[0038] Similarly, when the extending direction of the above-mentioned Wiegand wire structure is the first direction, the Wiegand wire structure has a third cross-sectional view in the direction perpendicular to the first direction, and the wire, the adhesion layer, the magnetic layer, and the protective layer are arranged in concentric circles in the third cross-sectional view. Similarly, the circle corresponding to the wire may have a first diameter, the circle corresponding to the adhesion layer may have a second diameter, the circle corresponding to the magnetic layer may have a third diameter, and the circle corresponding to the protective layer may have a fourth diameter. Then, the first diameter is less than the second diameter, the second diameter is less than the third diameter, and the third diameter is less than the fourth diameter.

[0039] In some alternative embodiments, to achieve the Wiegand effect and ensure the reliability of the Wiegand effect, the wire and the magnetic layer have different coercivities.

[0040] First, it should be noted that the wire and the magnetic layer with different coercivities mentioned above are the wire and the magnetic layer in the same Wiegand wire structure. Specifically, to make the structure formed by the magnetic layer surrounding the outer periphery of the wire have a bistable magnetic state, the wire and the magnetic layer can have different coercivities. Exemplarily, in this application, since the magnetic materials forming the wire and the magnetic layer are different, the wire and the magnetic layer can have different coercivities. More intuitively, in some alternative embodiments, the magnetic material forming the wire may have a first coercivity, the magnetic material forming the magnetic layer may have a second coercivity, and the first coercivity is not equal to the second coercivity.

[0041] Furthermore, in some alternative embodiments, the first coercivity may be less than the second coercivity. That is, in this embodiment, the material forming wire 1 in the Wiegand wire structure may be a soft magnetic material, while the material forming magnetic layer 2 in the same Wiegand wire structure may be a hard magnetic material. Thus, in this embodiment, the initial magnetization state of the Wiegand wire structure may be that wire 1 and magnetic layer 2 have parallel magnetization directions. Under the action of an external magnetic field, since wire 1 is formed of a soft magnetic material, the magnetization direction of wire 1 can be flipped first, and the magnetization direction of magnetic layer 2 temporarily remains unchanged as the magnetization direction in the initial magnetization state, so that wire 1 and magnetic layer 2 have anti-parallel magnetization directions, as Figure 1 shown. Then, under the further action of the external magnetic field, the magnetization direction of magnetic layer 2 in the Wiegand wire structure is then flipped, so that wire 1 and magnetic layer 2 in the final magnetization state of the Wiegand wire structure have parallel magnetization directions again. It should be noted that the initial magnetization state of the Wiegand wire structure is opposite to the final magnetization state. Exemplarily, the initial magnetization state of the Wiegand wire structure corresponds to that the magnetization directions of wire 1 and magnetic layer 2 in the Wiegand wire structure are both the first magnetization direction (→ and ), the magnetization directions of the wire 1 and the magnetic layer 2 in the same Wiegand wire structure corresponding to the final magnetization state are both the second magnetization direction (← and ⊙), and the above first magnetization direction (→ and ) can be antiparallel to the second magnetization direction (← and ⊙).

[0042] Furthermore, in some alternative embodiments, the above first coercivity can be greater than the above second coercivity. That is, in this embodiment, the material forming the wire 1 in the Wiegand wire structure can be a hard magnetic material, while the material forming the magnetic layer 2 in the same Wiegand wire structure can be a soft magnetic material. Thus, in this embodiment, the initial magnetization state of the Wiegand wire structure can be such that the wire 1 and the magnetic layer 2 have parallel magnetization directions. Under the action of an external magnetic field, since the magnetic layer 2 is formed of a soft magnetic material, the magnetization direction of the magnetic layer 2 can first flip, and the magnetization direction of the wire 1 temporarily remains unchanged from the magnetization direction in the initial magnetization state, so that the wire 1 and the magnetic layer 2 have antiparallel magnetization directions, as Figure 2 shown. Then, under the further action of the external magnetic field, the magnetization direction of the wire 1 in the Wiegand wire structure then flips, so that the wire 1 and the magnetic layer 2 in the final magnetization state of the Wiegand wire structure again have parallel magnetization directions. It should be noted that the initial magnetization state of the Wiegand wire structure is opposite to the final magnetization state. Exemplarily, the initial magnetization state of the Wiegand wire structure corresponds to the magnetization directions of the wire 1 and the magnetic layer 2 in the Wiegand wire structure both being the third magnetization direction (← and ⊙), and the magnetization directions of the wire 1 and the magnetic layer 2 in the same Wiegand wire structure corresponding to the final magnetization state are both the fourth magnetization direction (→ and ), and the above third magnetization direction (← and ⊙) can be antiparallel to the fourth magnetization direction (→ and ). Optionally, an adhesion layer 3 can also be included in this embodiment, as Figure 2 shown.

[0043] Among them, the above first magnetization direction can be parallel or antiparallel to the third magnetization direction.

[0044] In some alternative embodiments, in order to achieve a more complex magnetic response, the above magnetic layer can include multiple layers, and the multiple above magnetic layers are stacked and surrounded around the outer periphery of the above wire.

[0045] Specifically, in the above-described embodiments, the Weigand wire structure includes at least a metal wire and multiple magnetic layers disposed around the outer periphery of the metal wire. Thus, when the extending direction of the Weigand wire structure is the first direction, the Weigand wire structure has a fourth cross-sectional view in the direction perpendicular to the first direction, and the metal wire and the multiple magnetic layers are arranged in concentric circles in the fourth cross-sectional view. Similarly, the circle corresponding to the metal wire may have a first diameter, the circle corresponding to the innermost magnetic layer of the multiple magnetic layers may have a fifth diameter, and the circle corresponding to the outermost magnetic layer of the multiple magnetic layers may have a sixth diameter. Then, the first diameter is less than the fifth diameter, and the fifth diameter is less than the sixth diameter.

[0046] Further, when the Weigand wire structure further includes an adhesion layer in addition to the metal wire and the multiple magnetic layers, the Weigand wire structure has a fifth cross-sectional view in the direction perpendicular to the first direction, and the metal wire, the adhesion layer, and the multiple magnetic layers are arranged in concentric circles in the fifth cross-sectional view. Similarly, the circle corresponding to the metal wire may have a first diameter, the circle corresponding to the adhesion layer may have a second diameter, the circle corresponding to the innermost magnetic layer of the multiple magnetic layers may have a fifth diameter, and the circle corresponding to the outermost magnetic layer of the multiple magnetic layers may have a sixth diameter. Then, the first diameter is less than the second diameter, the second diameter is less than the fifth diameter, and the fifth diameter is less than the sixth diameter.

[0047] Further, when the Weigand wire structure further includes a protective layer in addition to the metal wire and the multiple magnetic layers, the Weigand wire structure has a sixth cross-sectional view in the direction perpendicular to the first direction, and the metal wire, the multiple magnetic layers, and the protective layer are arranged in concentric circles in the sixth cross-sectional view. Similarly, the circle corresponding to the metal wire may have a first diameter, the circle corresponding to the innermost magnetic layer of the multiple magnetic layers may have a fifth diameter, the circle corresponding to the outermost magnetic layer of the multiple magnetic layers may have a sixth diameter, and the circle corresponding to the protective layer may have a fourth diameter. Then, the first diameter is less than the fifth diameter, the fifth diameter is less than the sixth diameter, and the sixth diameter is less than the fourth diameter.

[0048] Further, in the case where an adhesion layer and a protective layer are further included in the Wiegand wire structure in addition to the metal wire and the multi-layer magnetic layer, the Wiegand wire structure has a seventh cross-sectional view in a direction perpendicular to the first direction, and the metal wire, the adhesion layer, the multi-layer magnetic layer, and the protective layer are arranged in concentric circles in the seventh cross-sectional view. Similarly, the circle corresponding to the metal wire may have a first diameter, the circle corresponding to the adhesion layer may have a second diameter, the circle corresponding to the innermost magnetic layer of the multi-layer magnetic layer may have a fifth diameter, and the circle corresponding to the outermost magnetic layer of the multi-layer magnetic layer may have a sixth diameter. The circle corresponding to the protective layer may have a fourth diameter. Then, the first diameter is less than the second diameter, the second diameter is less than the fifth diameter, the fifth diameter is less than the sixth diameter, and the sixth diameter is less than the fourth diameter.

[0049] As can be seen from the above, different coercivities of the metal wire and the magnetic layer in the Wiegand wire structure can achieve the effect of making the Wiegand wire structure have a bistable magnetization state. Thus, in the case where the magnetic layer includes multiple layers, at least two magnetic layers in the multi-layer magnetic layer can be formed of different magnetic materials. However, it should be noted that if the material forming the magnetic layer is a hard magnetic material and the material forming the metal wire is a soft magnetic material, it is only necessary that the minimum coercivity of the magnetic layer is greater than the coercivity of the metal wire; and similarly, in the case where the magnetic layer includes multiple layers, at least two magnetic layers in the multi-layer magnetic layer can be formed of different magnetic materials. If the material forming the magnetic layer is a soft magnetic material and the material forming the metal wire is a hard magnetic material, it is only necessary that the maximum coercivity of the magnetic layer is less than the coercivity of the metal wire.

[0050] In order to adjust the magnetic response to optimize the performance of the Wiegand wire structure, in some alternative embodiments, those skilled in the art can select the number of multi-layer magnetic layers and the material of each magnetic layer according to actual needs. Optionally, the materials of each magnetic layer may be different from each other.

[0051] In some alternative embodiments, the materials of the metal wire and the magnetic layer are independently selected from any one or more of cobalt iron vanadium alloy, nickel iron alloy, cobalt iron, nickel iron, and nickel.

[0052] Specifically, in the above embodiments, the material of the metal wire may include, but is not limited to, any one or more of cobalt iron vanadium alloy and nickel iron alloy; the material of the magnetic layer may include, but is not limited to, any one or more of cobalt iron, nickel iron, and nickel. That is, compared with the prior art, the present application broadens the available materials for the Wiegand wire structure. Those skilled in the art can make reasonable selections according to actual needs, and the application does not make specific limitations.

[0053] Optionally, the material of the adhesion layer in the present application includes, but is not limited to, any one or more of zinc, tin, nickel, chromium, titanium, and tantalum, so as to enhance the adhesion between the metal wire and the magnetic layer. Those skilled in the art can make reasonable selections according to actual needs, and the application does not make specific limitations.

[0054] Optionally, the material of the protective layer in the present application may include, but is not limited to, any one or more of zinc, tin, nickel, chromium, titanium, tantalum, and resin, so as to achieve the purpose of anti-oxidation and anti-corrosion. Those skilled in the art can make reasonable selections according to actual needs, and the application does not make specific limitations.

[0055] In some alternative embodiments, in order to maintain the consistency of the Wiegand wire structure in all directions, the maximum distance between the magnetic layer surrounding the outer periphery of the metal wire and the surface of the metal wire is equal in all directions, that is, in the direction away from the metal wire, the thickness of the magnetic layer is uniform.

[0056] According to another aspect of the present application, a method for manufacturing a Wiegand wire structure is provided, including: providing a metal wire; forming a magnetic layer on the outer periphery of the metal wire so that the magnetic layer forms a cladding structure of the metal wire, and the materials of the metal wire and the magnetic layer are different.

[0057] Specifically, on the basis of providing the metal wire, in order to uniformly coat the magnetic layer on the outer periphery of the metal wire, the magnetic layer can be formed by an electroplating process, and the electroplating process can be controlled by electroplating parameters such as current density, deposition time, temperature, and pH value, so as to obtain the magnetic layer in the Wiegand wire structure. Optionally, after the step of electroplating the magnetic layer, the method for manufacturing the Wiegand wire structure may further include an annealing treatment to release the internal stress of the magnetic layer and adjust the crystallinity of the magnetic layer through the annealing treatment, so as to optimize and stabilize the performance of the Wiegand wire structure. In some other alternative embodiments, the process of forming the magnetic layer on the outer periphery of the metal wire may also include, but is not limited to, the solution method or the evaporation plating method.

[0058] Specifically, when forming the above-mentioned Weigand wire structure by electroplating process, there can be multiple tanks on the production line. Exemplarily, the above-mentioned tanks can at least include a wire feeding tank (for placing metal wires), a first cleaning tank (for cleaning water-soluble and fat-soluble impurities attached to the surface of the metal wires), an electroplating tank (for plating different magnetic layers on the surface of the metal wires), a second cleaning tank (for cleaning the residual solution attached to the surface of the magnetic layer), a drying tank (for drying the Weigand wire structure), and a wire collecting tank (for placing the Weigand wire structure formed by the electroplating process). Exemplarily, the metal wire can first start to move from the wire feeding tank, and then be sequentially transferred by the guide wheels between the tanks until it passes through the above-mentioned first cleaning tank, electroplating tank, second cleaning tank, drying tank, and wire collecting tank in sequence to complete the preparation of the Weigand wire structure in the wire collecting tank. Among them, water, solution, or gas can be placed in each of the above-mentioned tanks, and the above-mentioned water, solution, or gas can be supplied through a supporting storage cylinder. Optionally, all object transfers involved in the above-mentioned production line can rely on the coordinated work of pumps, machines, and valves.

[0059] The production of the Weigand wire structure can be controlled by a set of precise electrical systems to achieve automated production. Optionally, in order to improve the antioxidant and anti-sulfidation capabilities of the Weigand wire structure, the surface of the Weigand wire structure can be painted. Optionally, the painting work can be completed by adding a painting tank and equipment related to the configuration of the painting tank. Among them, the above-mentioned painting tank can be placed between the drying tank and the wire collecting tank so that the Weigand wire structure can be painted after being dried and before being wound.

[0060] In the above-mentioned embodiments, a metal wire can be provided first, and then a magnetic layer can be formed on the outer periphery of the metal wire. Among them, the material for forming the above-mentioned metal wire and the material for forming the above-mentioned magnetic layer are both magnetic materials. Further, since the magnetic material for forming the metal wire is different from the magnetic material for forming the magnetic layer, and different magnetic materials have different magnetic properties, the Weigand wire structure composed of the above-mentioned metal wire and magnetic layer can have a bistable magnetization state. It can be seen that compared with the prior art, the material of the Weigand wire structure in this application can be composed of at least two magnetic materials, thus broadening the range of materials for making the Weigand wire structure and further improving the design flexibility of the Weigand wire. In addition, since the bistable magnetization state of the Weigand wire structure can be achieved through the magnetic materials of the metal wire and the magnetic layer, there is no need for complex mechanical structure adjustment, avoiding the stress treatment process in the prior art, enhancing the process controllability of the Weigand wire, ensuring that the performance of the Weigand wire structure is reliable and stable, and having high practicality.

[0061] The Weigand wire structure and the manufacturing method thereof can be used in various application fields, including but not limited to magnetic field sensing, position detection, micro-energy harvesting, switches, encoders, and flow meters, etc. The reliability, stability, and performance advantages of this Weigand wire structure of the present application will make it an ideal choice for magnetic field induction and control systems. Exemplarily, in some alternative embodiments, the present application also provides a Weigand sensor, which may include a Weigand wire structure and an induction coil, wherein the above-mentioned Weigand wire structure can be the Weigand wire structure in any one of the above-mentioned embodiments, or the above-mentioned Weigand wire structure can also be the Weigand wire structure formed by the manufacturing method of the Weigand wire structure mentioned above.

[0062] Optionally, in order to obtain a Weigand sensor with a high output signal, materials with high saturation magnetization can be used. As described above, it will not be repeated here.

[0063] Among them, in the use of the Weigand sensor, the Weigand signal mainly originates from the switching between the parallel state and the anti-parallel state of the magnetization directions of the inner and outer layers of the Weigand wire. In these two magnetic layers, the magnetization reversal of the softer magnetic layer plays a key role in the Weigand signal.

[0064] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0065] A Weigand wire structure provided by the present application includes a metal wire and a magnetic layer. Among them, the above-mentioned magnetic layer can be disposed around the outer periphery of the metal wire, and the material forming the above-mentioned metal wire and the material forming the above-mentioned magnetic layer are both magnetic materials. Further, since the magnetic material forming the metal wire is different from the magnetic material forming the magnetic layer, due to different magnetic properties of different magnetic materials, the Weigand wire structure composed of the above-mentioned metal wire and magnetic layer can have a bistable magnetization state. It can be seen that compared with the prior art, the material of the Weigand wire structure can be composed of at least two magnetic materials, thereby broadening the range of materials for manufacturing the Weigand wire structure and further enhancing the design flexibility of the Weigand wire. In addition, since the bistable magnetization state of the Weigand wire structure can be achieved through the magnetic materials of the metal wire and the magnetic layer, complex mechanical structure adjustments are not required, the stress treatment process in the prior art is avoided, the process controllability of the Weigand wire is enhanced, and it is determined that the performance of the Weigand wire structure is reliable and stable, with high practicality.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A Weigand wire structure, characterized in that, Comprising: A wire; A magnetic layer, disposed around the outer periphery of the wire, and the material forming the wire and the material forming the magnetic layer are different magnetic materials.

2. The Weigand wire structure according to claim 1, wherein Further comprising: An adhesion layer, disposed around the outer periphery of the wire, and the adhesion layer is located between the wire and the magnetic layer.

3. The Weigand wire structure according to claim 1, wherein, Further comprising: A protective layer, disposed around the outer periphery of the magnetic layer, and the magnetic layer is located between the wire and the protective layer.

4. The Weigand wire structure according to any one of claims 1 to 3, characterized in that, The wire and the magnetic layer have different coercive forces.

5. The Weigand wire structure according to any one of claims 1 to 3, characterized in that The magnetic layer comprises multiple layers, and the multiple magnetic layers are stacked and disposed around the outer periphery of the wire.

6. The Weigand wire structure according to any one of claims 1 to 3, characterized in that, The materials of the wire and the magnetic layer are independently selected from any one or more of cobalt-iron-vanadium alloy, nickel-iron alloy, cobalt-iron, nickel-iron, and nickel.

7. The Weigand wire structure according to claim 2, wherein, The materials of the adhesion layer and the protective layer are independently selected from any one or more of zinc, tin, nickel, chromium, titanium, and tantalum.

8. A manufacturing method of a Weigand wire structure according to any one of claims 1 to 7, characterized in that, Comprising: Providing a wire; Forming a magnetic layer on the outer periphery of the wire so that the magnetic layer constitutes a cladding structure of the wire, and the materials of the wire and the magnetic layer are different.

9. The manufacturing method according to claim 8, wherein, The magnetic layer is formed by electroplating.

10. A Wiegand sensor, characterized in that, Comprising a Weigand wire structure according to any one of claims 1 to 7 and an induction coil wound on the side of the magnetic layer of the Weigand wire structure away from the wire.

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