Magnetic measurement device

Abstract

The utility model relates to the technical field of magnetic measurement, and discloses a magnetic measurement device. Comprising a low-temperature cavity, a gradient magnetic field device and a light path assembly. The gradient magnetic field device is arranged in the low-temperature cavity and used for generating a gradient magnetic field; a to-be-tested sample is fixed on the sample table and is arranged in the gradient magnetic field; the vibration detection assembly is used for detecting vibration of the to-be-detected sample or the sample rod through the detection light, so that vibration data of the to-be-detected sample or the sample rod can be obtained. The gradient magnetic field device and the sample rod are arranged in the low-temperature cavity, so that thermal noise and thermal expansion caused by environment temperature can be remarkably reduced, the influence of temperature change on physical characteristics of equipment parts and a to-be-measured sample is reduced, signals in the measurement process are clearer, and errors are smaller. The stability of the magnetic measurement device and the accuracy of the measurement result are improved, and the quality and reliability of the whole magnetic measurement are improved.

Description

Technical Field

[0001] The present application relates to the field of magnetic measurement technology, for example, to a magnetic measurement device. Background Art

[0002] Currently, high-precision magnetic characterization of thin-film materials is fundamental to research in condensed matter physics, magnetism, microelectronics, and spintronics. A common magnetic measurement instrument on the market is the alternating gradient force magnetometer (AGM). Traditional AGMs utilize the fact that a magnetic object in an alternating gradient field is subjected to a periodic force, which in turn causes the sample rod to vibrate periodically, generating a voltage in the piezoelectric bimorph. This measurement scheme operates at high frequencies and has high sensitivity, but suffers from poor accuracy in complex environments, complex sample rod design, and high cost.

[0003] The related technology discloses a reflected light generating component, a magnetic measurement system and a magnetic measurement method. By utilizing the principle of AGM gradient resonance, high-speed and high-sensitivity measurement can be achieved. At the same time, the principle of laser Doppler vibration measurement can be used to achieve high-precision displacement and speed measurement without contact and over a long distance. Combining the two can realize a new measurement solution with high measurement accuracy and strong anti-noise ability.

[0004] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0005] Related technologies have improved the accuracy of AGM measurements to a certain extent. However, in actual applications, thermal expansion and thermoelectromagnetic effects caused by temperature changes can lead to deviations in instrument component alignment and sample position, while also affecting sensor sensitivity and response. This results in poor accuracy in AGM measurements under varying temperature environments. Utility Model Content

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide a magnetic measurement device to solve the technical problem of inaccurate measurement of an alternating gradient magnetometer in a variable temperature environment.

[0008] In some embodiments, the magnetic measurement device includes: a low-temperature cavity; a gradient magnetic field device, disposed in the low-temperature cavity, for generating a gradient magnetic field; a sample stage, on which a sample to be measured is fixed, and the sample to be measured is disposed in the gradient magnetic field; and a vibration detection component, for detecting the vibration of the sample to be measured or the sample rod by detecting light.

[0009] Optionally, the cryogenic chamber includes: a heat exchanger connected to the target component, for adjusting the temperature of the target component, wherein the target component includes a sample rod and / or a gradient magnetic field device.

[0010] Optionally, the sample rod includes: a long arm connected to the fixing seat; and a short arm connected to the long arm for fixing the sample to be tested.

[0011] Optionally, the sample rod is L-shaped.

[0012] Optionally, the sample rod is a reed.

[0013] Optionally, the sample holder includes: a crossbeam for placing the sample to be tested; wherein both ends of the crossbeam are respectively in contact with the heat conduction block for heat exchange with the low-temperature cavity.

[0014] Optionally, the low-temperature chamber includes: a light-transmitting window for transmitting the detection light.

[0015] Optionally, the light-transmitting window is arranged on the top and / or side of the low-temperature chamber.

[0016] Optionally, the gradient magnetic field device includes: at least one pair of gradient magnetic field units, and the gradient magnetic field unit includes: a magnet; and / or an electromagnetic coil.

[0017] Optionally, the sample to be tested is arranged between two oppositely arranged gradient magnetic field units.

[0018] Optionally, the gradient magnetic field device further includes: a superconducting magnet including a housing cavity, and the gradient magnetic field unit is arranged in the housing cavity.

[0019] Optionally, the magnetic measurement device further includes: a detection device for collecting reflected light, converting it into a digital signal, and generating the magnetization intensity of the sample to be measured.

[0020] The magnetic measurement device provided by the embodiments of the present disclosure can achieve the following technical effects:

[0021] The gradient magnetic field device is located within the cryogenic chamber to generate a gradient magnetic field. The sample to be measured is placed within the gradient magnetic field. The vibration detection assembly is used to detect the vibration of the sample or sample rod using detection light. This allows the magnetization intensity of the sample to be measured to be analyzed based on the vibration data of the sample or sample rod. By placing the gradient magnetic field device and sample rod within the cryogenic chamber, the thermal noise and thermal expansion caused by the ambient temperature can be significantly reduced, thereby reducing the impact of temperature changes on the physical properties of the equipment components and the sample to be measured. This results in clearer signals and smaller errors during the measurement process. This improves the stability of the magnetic measurement device and the accuracy of the measurement results, thereby enhancing the quality and reliability of the entire magnetic measurement.

[0022] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0024] Figure 1 is a schematic diagram of the overall structure of a magnetic measurement device provided by an embodiment of the present disclosure;

[0025] Figure 2 is a structural schematic diagram of a gradient magnetic field device provided by an embodiment of the present disclosure;

[0026] Figure 3 is a schematic structural diagram of another gradient magnetic field device provided by an embodiment of the present disclosure;

[0027] Figure 4 is a schematic structural diagram of a sample rod provided by an embodiment of the present disclosure;

[0028] Figure 5 Schematic diagram of the structure of another sample rod provided in an embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 10: low temperature chamber; 11: light transmission window;

[0031] 20: gradient magnetic field device; 21: first magnet; 22: first electromagnetic coil; 23: first gradient magnetic field unit; 24: second magnet; 25: second electromagnetic coil; 26: second gradient magnetic field unit; 27: superconducting magnet; 28: accommodation cavity;

[0032] 30: Sample rod; 31: Long arm; 32: Short arm; 33: Fixed seat; 34: Screw hole;

[0033] 40: Vibration detection component. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0036] Combine Figures 1 to 5 As shown, an embodiment of the present disclosure provides a magnetic measurement device, comprising a cryogenic chamber 10, a gradient magnetic field device 20, a sample holder 30, and a vibration detection assembly 40. The gradient magnetic field device 20 is disposed within the cryogenic chamber 10 and is used to generate a gradient magnetic field. A sample to be measured is fixed to the sample holder 30 and is disposed within the gradient magnetic field. The vibration detection assembly 40 is used to detect vibration of the sample to be measured or the sample holder 30 using detection light.

[0037] In the embodiment of the present disclosure, the cryogenic chamber 10 is used to provide a low-temperature magnetic measurement environment. Specifically, the cryogenic chamber 10 can cool the sample to be measured so that magnetic measurements can be performed under low-temperature conditions. It can also cool the superconducting coils or other sensitive components in the gradient magnetic field device 20. The vibration detection assembly 40 includes a transmitting device and a receiving device. The transmitting device is used to transmit the object light irradiated on the sample to be measured or the sample rod 30, and the receiving device is used to receive the reflected light of the sample to be measured or the sample rod 30. The detection light includes the object light and the reflected light. Both the transmitting device and the receiving device can be set at any position of the magnetic measuring device, for example, at the top of the magnetic measuring device or at any position between the top of the magnetic measuring device and the top of the cryogenic chamber 10. In practical applications, both the transmitting device and the receiving device can be set at the top of the magnetic measuring device, that is, the reflected light can return along the optical path of the incident object light and thus be received by the receiving device.

[0038] In the disclosed embodiment, when a sample is placed in an alternating gradient magnetic field, the gradient magnetic field exerts a periodic force on the sample on the sample holder 30. This force is proportional to the gradient of the gradient magnetic field, causing the sample and the sample holder 30 holding the sample to vibrate. Resonance occurs when the vibration frequency of the sample holder 30 matches the frequency of the magnetic field. During measurement, object light can be directed either onto the sample or onto the sample holder 30. For example, directing the object light onto the sample ensures that the reflected light carries magnetic information about the sample surface, allowing direct analysis of the sample's magnetic characteristics, such as magnetization intensity and magnetic domain structure. In certain measurements, such as laser Doppler vibrometers, the vibration characteristics of the sample holder 30 are correlated with the magnetic response of the sample. Directing the object light onto the sample holder 30 can detect the vibration of the sample holder 30 caused by the gradient magnetic field, thereby indirectly measuring the sample's magnetism.

[0039] In the magnetic measurement device provided by the embodiment of the present disclosure, the gradient magnetic field device 20 is disposed within the cryogenic chamber 10 for generating a gradient magnetic field, the sample to be measured is disposed within the gradient magnetic field, and the vibration detection component 40 is used to detect the vibration of the sample to be measured or the sample rod 30 by detecting light, so that the magnetization intensity of the sample to be measured can be analyzed based on the vibration data of the sample to be measured or the sample rod 30. By disposing the gradient magnetic field device 20 and the sample rod 30 within the cryogenic chamber 10, the thermal noise and thermal expansion caused by the ambient temperature can be significantly reduced, thereby reducing the impact of temperature changes on the physical properties of the equipment components and the sample to be measured, making the signal during the measurement process clearer and the error smaller. This improves the stability of the magnetic measurement device and the accuracy of the measurement results, thereby enhancing the quality and reliability of the entire magnetic measurement.

[0040] Optionally, the cryogenic chamber includes a heat exchanger connected to a target component for adjusting the temperature of the target component, wherein the target component includes a sample rod and / or a gradient magnetic field device.

[0041] In the disclosed embodiment, the cryogenic chamber 10 includes an insulating shell, a vacuum system, and a refrigeration system. The insulating shell comprises an outer layer of insulating material and an inner vacuum container, which is used to maintain a low-temperature environment and reduce the intrusion of external heat. The insulating shell also includes a cold shield, located inside or outside the vacuum container, to reduce the radiation of cold energy from the superconducting magnet 27. The vacuum system includes a vacuum pump and vacuum piping. To maintain a high vacuum environment within the cryogenic chamber 10, the vacuum pump and corresponding vacuum piping are used to extract and maintain the vacuum environment within the cryogenic chamber 10. The refrigeration system includes a compressor, a coolant reservoir, a heat exchanger, and a temperature control system. The refrigeration system maintains the low-temperature environment within the cryogenic chamber 10 by circulating a coolant (such as liquid helium or liquid nitrogen) or other refrigeration technologies. The temperature control system includes a temperature sensor, a controller, and a heater to precisely control the temperature within the cryogenic chamber 10, ensuring that the sample to be measured remains at a low temperature during measurement. The heat exchanger is connected to the target component to regulate the temperature of the target component. The target component includes the sample holder 30 and / or the gradient magnetic field device 20. The heat exchanger can be connected to the target component through direct or indirect contact to achieve cooling of the target component. For example, the heat exchanger can cool the target component through direct contact, transfer cold energy to the target component through air, or exchange heat with the target component through other media to cool the target component. Specifically, the heat exchanger can be directly connected to the superconducting magnet 27 and / or the sample holder 30, or the heat exchanger can be connected to the superconducting magnet 27 and / or the sample holder 30 through a cold chain to reduce the temperature of the superconducting magnet 27 and / or the sample holder 30 and / or the sample to be tested.

[0042] By installing a heat exchanger within cryogenic chamber 10 and connecting it to target components such as sample holder 30 and / or gradient magnetic field device 20, the temperature of these target components can be precisely controlled, thereby reducing thermal noise and thermal expansion caused by ambient temperature fluctuations and ensuring the clarity and stability of the measurement signal. Whether conducting magnetic property research under cryogenic conditions or testing that requires precise temperature control to observe magnetic changes in the sample under test, more accurate and reliable data can be obtained, improving the reliability of magnetic measurement results.

[0043] Optionally, combined Figure 4 and Figure 5 As shown, the sample holder 30 includes a long arm 31 and a short arm 32. The long arm 31 is connected to the fixing base 33; the short arm 32 is connected to the long arm 31, and is used to fix the sample to be tested.

[0044] In the disclosed embodiments, the sample holder 30 can have any shape including a long arm 31 and a short arm 32. For example, a T-shape, a cross shape, and / or a fork shape. The sample holder 30 can be made of any material suitable for magnetic measurement, for example, stainless steel, aluminum alloy, and / or titanium alloy. The sample to be measured can be secured to the short arm 32 of the sample holder by any means. For example, a micro-clamp or clamp can be used to fix the sample to be tested on the short arm 32 of the sample rod 30. The clamp can be a spiral, spring or snap-on clamp. Alternatively, for small-sized samples to be tested, an adhesive can be used to bond the sample to the sample rod 30, such as epoxy resin or a special instant adhesive. The bonding point should be selected in the middle or top of the short arm 32 of the sample rod 30. Alternatively, a small magnet can be installed on the short arm 32 of the sample rod 30 to use magnetic force to adsorb and fix the sample to be tested. Alternatively, a micro-vacuum hole can be set on the sample rod 30 to fix the sample to be tested on the short arm 32 by vacuum adsorption. Alternatively, the principle of electrostatic adsorption can be used to generate electrostatic force by applying voltage to adsorb the sample to be tested on the conductive sample rod 30. Alternatively, a micro-suction cup can be used to adsorb the sample to be tested in a vacuum environment.

[0045] In the embodiment of the present disclosure, Figure 5 As shown, the sample holder 30 is secured by a fixing base 33. Specifically, the fixing method can be any method. For example, a slot can be provided on the fixing base 33, and a corresponding pin or protrusion can be provided on the sample holder 30. The pin can be inserted into the slot to secure the sample holder 30. Alternatively, a guide rail can be provided on the fixing base 33, and a slider that matches the rail can be provided on the sample holder 30. The sample holder 30 can slide on the guide rail and be secured in a desired position. In practical applications, a screw hole 34 can be provided on the fixing base 33, and the sample holder 30 can be tightened to the support frame using a nut, bolt, and screw hole 34.

[0046] In this way, by securing the sample to be tested to the short arm 32 of the sample rod 30, that is, securing the sample to be tested to the end of the long arm 31 away from the fixing seat 33, the movement distance of the sample to be tested in the gradient magnetic field can be increased, thereby generating a greater torque under the action of the magnetic field gradient, thereby increasing the amplitude of the vibration of the sample to be tested or the sample rod 30. A larger amplitude can make the magnetic response signal of the sample to be tested stronger, thereby improving the signal-to-noise ratio of the signal, allowing the magnetic measurement device to more accurately detect the magnetic properties of the sample. In addition, a larger amplitude can also improve the sensitivity and resolution of the measurement, allowing the magnetic measurement device to more accurately measure weak magnetic signals, which is of great significance for studying the microscopic magnetic structure and magnetization process of materials.

[0047] Optionally, the sample holder 30 is L-shaped.

[0048] In this way, in the magnetic measurement device of the alternating gradient magnetometer, an L-shaped sample rod 30 is used, and the long arm 31 is connected to the fixed base 33, so that the long arm 31 of the sample rod 30 can be away from the area where the magnetic field gradient changes fastest, thereby reducing the direct force of the magnetic field on the sample rod 30, reducing the vibration caused by the magnetic field, and improving the stability of the measurement process.

[0049] Optionally, the sample rod 30 is a reed.

[0050] In the embodiment of the present disclosure, the reed can be made of any elastic material, such as stainless steel, special alloy or other non-magnetic materials.

[0051] Thus, in the magnetic measurement device, a reed is used as the sample holder 30. Due to its excellent elasticity and low natural frequency, the reed quickly returns to its original position when the sample is subjected to external vibration or impact, thereby reducing the impact on the position of the sample and improving the positioning accuracy of the sample and the stability of the measurement. Furthermore, the reed's flexibility helps absorb and isolate small vibrations from other parts of the device, protecting the sample from interference.

[0052] Optionally, the sample holder includes a crossbeam. The crossbeam is used to place the sample to be tested. The two ends of the crossbeam are respectively in contact with the heat conduction block for heat exchange with the low temperature chamber.

[0053] In the embodiment of the present disclosure, the sample to be tested can be directly placed flat on the beam-type sample rod 30 to achieve vertical sample testing.

[0054] In other embodiments, in-plane sample testing can also be achieved by providing a protrusion structure in the middle of the beam-type sample rod 30 and placing the sample to be tested on the protrusion of the sample rod 30, such as the T-shaped sample rod 30 in some of the above embodiments.

[0055] Thus, the beam-shaped sample holder 30 provides a platform upon which the sample to be tested can be placed flat, thereby orienting the sample to be tested perpendicular to the gradient magnetic field, enabling vertical sample testing. Furthermore, by providing a protrusion in the middle of the beam-shaped sample holder 30, the sample to be tested can be placed on the protrusion of the sample holder 30, for example, by attaching the sample to be tested vertically to the protrusion of the sample holder 30, thereby enabling in-plane sample testing.

[0056] Optionally, the cryogenic chamber 10 includes a light-transmitting window 11. The light-transmitting window 11 is used to transmit the detection light.

[0057] In the disclosed embodiment, the light-transmitting window 11 can be made of any material with good optical transparency and low thermal conductivity, such as quartz glass, sapphire, or special plastics. Other components corresponding to the light-transmitting window 11, such as the superconducting magnet 27 and / or the gradient magnetic field unit, can be provided with an optical path for the detection light to pass through.

[0058] Thus, because the light-transmitting window 11 is made of a transparent material and can maintain high transparency and low absorption under low-temperature conditions, it allows the object light and reflected light to freely transmit in the optical path without being affected by the low-temperature environment. Therefore, by providing the light-transmitting window 11 in the cryogenic chamber 10, the magnetic measurement device can perform optical measurements, such as laser Doppler vibrometer, in low-temperature environments, thereby improving the detection accuracy of the vibration or displacement of the sample to be measured, thereby achieving high-precision measurement of the magnetic properties of the sample to be measured under low-temperature conditions.

[0059] Optionally, the light-transmitting window 11 is provided at the top and / or side of the low-temperature chamber 10 .

[0060] In the disclosed embodiment, in addition to positioning the light-transmitting window 11 at the top and / or side of the cryogenic chamber 10, the light-transmitting window 11 can also be positioned elsewhere within the cryogenic chamber 10, such as on the bottom surface. Accordingly, when the light-transmitting window 11 is positioned at the top, side, and / or bottom of the cryogenic chamber 10, corresponding optical elements are required to allow the object light from the vibration detection assembly 40 to pass through the light-transmitting window 11 and illuminate the sample to be measured, and for the reflected light to pass through the light-transmitting window 11 and be received by the receiving device. Optical elements include reflectors, convex lenses, and / or pentaprisms.

[0061] In this way, in addition to the top, the light-transmitting window 11 can also be set on the side or bottom of the low-temperature cavity 10, thereby meeting the needs of some special tests. The specific settings can be made according to the needs and will not be repeated here. The light-transmitting window 11 is set at the top position of the low-temperature cavity 10 so that the light-transmitting window 11 is as close to the sample as possible, reducing the propagation distance of the light path in the low-temperature cavity 10. Therefore, setting the light-transmitting window 11 at the top of the low-temperature cavity 10 reduces the scattering or absorption that the light may suffer during the propagation process, thereby improving the light transmission efficiency. In addition, the light-transmitting window 11 at the top allows the vibration detection component 40 to be directly aligned with the sample to be tested without the need for complex light path reflection or refraction inside the low-temperature cavity 10, thereby helping to simplify the structure of the vibration detection component 40, making the path of the object light and the reflected light more direct and clear, reducing the measurement error caused by the complexity of the light path, and improving the accuracy and reliability of the optical measurement.

[0062] Optionally, the gradient magnetic field device 20 includes at least one pair of gradient magnetic field units, and the gradient magnetic field unit includes: a magnet; and / or an electromagnetic coil.

[0063] In the embodiment of the present disclosure, the gradient magnetic field unit may be a magnet, or an electromagnetic coil, or a combination of a magnet and an electromagnetic coil.

[0064] In practical applications, a pair of electromagnetic coils can be used, with either pair arranged along the Y-axis or along the X-axis, with the sample to be tested positioned between the two coils. By passing an alternating current through the electromagnetic coils, an alternating gradient magnetic field is generated. This alternating gradient magnetic field excites the movement of magnetic domains within the sample to be tested. Combined with high-resolution imaging techniques, the magnetic domain structure and the movement of magnetic domain walls within the sample can be observed.

[0065] In practical applications, multiple pairs of electromagnetic coils arranged along different axes can also be used. By changing the orientation of the sample to be tested relative to the direction of the magnetic field, the magnetic properties of the sample to be tested in different directions can be measured, thereby studying its magnetic anisotropy.

[0066] In practical applications, a combination of a magnet and an electromagnetic coil can also be used as a gradient magnetic field unit. The gradient magnetic field unit includes a magnet and an electromagnetic coil. Figure 2 As shown, the gradient magnetic field device 20 includes a first gradient magnetic field unit 23 and a second gradient magnetic field unit 26, which are arranged vertically along the Y-axis. The first gradient magnetic field unit 23 includes a first magnet 21 and a first electromagnetic coil 22. The second gradient magnetic field unit 26 includes a second magnet 24 and a second electromagnetic coil 25. The first electromagnetic coil 22 and the second electromagnetic coil 25 of the first gradient magnetic field unit 23 and the second gradient magnetic field unit 26 are both disposed on the surface of the magnets on the side closest to the sample to be tested.

[0067] In this way, the magnet can provide a stable and uniform background magnetic field, while the electromagnetic coil is used to generate a variable gradient magnetic field for more precise measurements. Thus, in a magnetic measurement device, the gradient magnetic field unit includes a magnet and / or an electromagnetic coil. The magnet can provide a stable magnetic field, while the electromagnetic coil can dynamically adjust the strength and gradient of the magnetic field by changing the current. This allows the magnetic measurement device to precisely control the magnetic field experienced by the sample to be measured to adapt to different measurement requirements and the characteristics of the sample to be measured, thereby obtaining more accurate magnetic measurement results.

[0068] In this way, by setting up at least one pair of gradient magnetic field units, a sufficiently strong magnetic field gradient can be generated, which can ensure that the sample to be tested experiences a uniform and controllable magnetic field environment in the gradient magnetic field, and generate a measurable force or torque on the sample to be tested, so that the magnetic property response of the sample to be tested can be accurately measured, thereby improving the sensitivity and resolution of the measurement.

[0069] Optionally, the sample to be tested is arranged between two oppositely arranged gradient magnetic field units.

[0070] In the disclosed embodiments, the sample to be tested can be placed at any position between the two gradient magnetic field units. For example, the sample to be tested can be placed at the center of the two gradient magnetic field units, so that the sample to be tested is in the overlapping area of the magnetic field gradients generated by the two gradient magnetic field units, thereby achieving the maximum magnetic field change rate; alternatively, the sample to be tested can be placed at an off-center position between the two gradient magnetic field units, that is, not on the center line, so as to study the response of the sample to the asymmetric magnetic field gradient; alternatively, the sample to be tested can be placed at an equidistant position between the two gradient magnetic field units to ensure that the sample to be tested is subjected to a uniform magnetic field gradient.

[0071] Thus, when the two gradient magnetic field units are positioned relative to each other, the magnetic fields they generate at the location of the sample to be tested interact, forming a gradient region. The magnetic field strength and direction of the gradient region can be adjusted based on the settings of the two gradient magnetic field units. Therefore, placing the sample to be tested between the two gradient magnetic field units positioned relative to each other can generate a precisely controllable gradient magnetic field environment for the sample to be tested. The sample to be tested will experience a continuously changing magnetic field environment within the gradient magnetic field, allowing the magnetic response of the sample to be tested to be detected at different magnetic field intensities, thereby obtaining detailed information on the magnetic properties of the sample to be tested.

[0072] Optionally, the gradient magnetic field device 20 further includes a superconducting magnet 27. The superconducting magnet 27 includes a receiving cavity, and the gradient magnetic field unit is disposed in the receiving cavity.

[0073] In the embodiment of the present disclosure, the superconducting magnet 27 can be a cylinder, a cuboid or other geometric shapes, and a receiving cavity for placing the gradient magnetic field unit is provided in the middle of the superconducting magnet 27. Figure 3As shown, the superconducting magnet 27 is a cylinder, and a cylindrical accommodating cavity in the middle portion passes through the top and bottom surfaces of the cylinder. The first gradient magnetic field unit 23 and the second gradient magnetic field unit 26 are both disposed in the accommodating cavity of the superconducting magnet 27 .

[0074] In this way, superconducting magnets enter a superconducting state below their critical temperature. In this superconducting state, superconducting magnets have zero resistance, maintaining a strong magnetic field without energy loss, thereby reducing thermal noise caused by resistive heating. When studying the microscopic magnetic structure and magnetization process of the sample under test, the strong magnetic field characteristics enable magnetic measurement equipment to perform higher-precision magnetic measurements, improving measurement sensitivity and stability.

[0075] Optionally, the magnetic measurement device further includes a detection device, which is used to convert the detection light into a digital signal and generate the magnetization intensity of the sample to be measured.

[0076] In the disclosed embodiment, the detection device includes a signal acquisition device and a signal processing device. The signal acquisition device is connected to the receiving device of the vibration detection assembly 40 and is used to collect reflected light received by the receiving device and convert it into a digital signal, namely, vibration data of the sample to be tested or the sample holder 30. The signal processing device is used to receive the digital signal sent by the signal acquisition device and generate the magnetization intensity of the sample to be tested. In this way, digital signals have higher anti-interference capabilities and are easier to perform accurate numerical analysis. Therefore, the signal acquisition device is directly connected to the receiving device and can collect the reflected light signals of the sample to be tested or the sample holder 30 in real time and convert these light signals into digital signals, thereby facilitating subsequent processing. The signal processing device receives the digital signal and, through corresponding algorithms and computational processing, can analyze the digital signal, such as measuring amplitude, frequency, and phase, constructing magnetization curves, analyzing hysteresis loops, etc., thereby accurately generating magnetic parameters such as the magnetization intensity of the sample to be tested, thereby improving the accuracy of magnetic measurement and the efficiency of data processing.

[0077] In this way, the detection device integrates the functions of signal acquisition and signal processing, can directly collect information from the reflected light of the sample to be tested, and convert these light signals into digital signals, thereby realizing the measurement of the magnetization state of the sample.

[0078] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A magnetic measuring device, characterized in that: include: cryogenic chamber; A gradient magnetic field device is arranged in the cryogenic chamber and is used to generate a gradient magnetic field; A sample rod, on which a sample to be tested is fixed, and the sample to be tested is placed in a gradient magnetic field; The vibration detection component is used to detect the vibration of the sample to be tested or the sample rod by detecting light.

2. The device according to claim 1, characterized in that The cryogenic chamber includes: The heat exchanger is connected to the target component and is used to adjust the temperature of the target component. The target component includes a sample rod and / or a gradient magnetic field device.

3. The device according to claim 1, characterized in that The sample holder includes: A long arm connected to a fixed base; The short arm is connected to the long arm and is used to fix the sample to be tested.

4. The device according to claim 3, characterized in that The sample holder is L-shaped.

5. The device according to claim 1, characterized in that The sample holder includes: The crossbeam is used to place the sample to be tested; wherein, both ends of the crossbeam are respectively in contact with the heat conducting block for heat exchange with the low temperature cavity.

6. The device according to any one of claims 1 to 5, characterized in that The cryogenic chamber includes: Light-transmitting window, used to transmit detection light.

7. The device according to claim 6, characterized in that include: The light-transmitting window is arranged on the top and / or side of the low-temperature chamber.

8. The device according to any one of claims 1 to 5, characterized in that The gradient magnetic field device includes: At least one pair of gradient magnetic field units, each gradient magnetic field unit comprising: a magnet; and / or an electromagnetic coil.

9. The device according to claim 8, characterized in that The sample to be tested is arranged between two gradient magnetic field units that are arranged opposite to each other.

10. The device according to claim 8, characterized in that The gradient magnetic field device also includes: The superconducting magnet comprises a housing cavity, and the gradient magnetic field unit is arranged in the housing cavity.

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