210 results about "Magnetic domain" patented technology

The invention discloses an AMR magnetic resistance unit, an AMR magnetic resistance module, an angle sensor and a chip wherein the AMR magnetic resistance unit comprises: a first AMR magnetic resistance unit; the first AMR magnetic resistance unit comprises a plurality of first AMR magnetic resistance strips, the plurality of first AMR magnetic resistance strips surround a circle center and are distributed in the radial direction, and each first AMR magnetic resistance strip is of a 60-degree arc-shaped strip-shaped structure. According to the AMR magnetic resistance unit, the AMR magnetic resistance module, the angle sensor and the chip, harmonic waves, especially sixth harmonic waves, can be better eliminated, magnetic domain collective hysteresis and noise are reduced, and the anti-eccentricity capacity is improved.

The invention discloses an energy-saving control method for a new-energy high-low-voltage direct-current relay. The energy-saving control method comprises the steps of analyzing a mapping relation between a silicon steel sheet stacking angle and a magnetic flux path deviation, calculating magnetic domain wall moving resistance according to magnetic domain boundary stress, determining a magnetic domain overturning speed by combining a magnetic field change rate, and measuring a hysteresis loop width parameter. Adjusting the width and frequency of the excitation current pulse according to the magnetic domain overturning frequency and the hysteresis loop offset and width to obtain an optimized excitation current pulse sequence, and determining the hysteresis loop expansion speed according to the hysteresis loop area change rate; the local high-temperature area temperature is analyzed through the iron core temperature rise rate, the local high-temperature area distribution and the magnetic domain energy dissipation data, if the local high-temperature area temperature exceeds the preset threshold value, the excitation current pulse is adjusted, stable iron core temperature rise control data is obtained, the coercive force change amplitude is determined, the magnetic hysteresis loss and the temperature rise are reduced, the stability of the relay under high-frequency switching is improved, and the reliability of the relay is improved. And the operation efficiency and reliability of the system are greatly improved.

To provide a non-heat-resistant magnetic domain refining treatment method capable of predicting a leakage magnetic flux value of a grain-oriented electromagnetic steel sheet after applying magnetic domain refining treatment before applying the magnetic domain refining treatment to the grain-oriented electromagnetic steel sheet.SOLUTION: A non-heat-resistant magnetic domain refining method in which a grain-oriented electrical steel sheet is irradiated with an energy beam to perform non-heat-resistant magnetic domain refining treatment on the grain-oriented electrical steel sheet, the non-heat-resistant magnetic domain refining method comprising: A magnetic flux leakage value prediction step of predicting a magnetic flux leakage value of the grain-oriented electrical steel sheet after being subjected to the magnetic domain refining treatment using a magnetic flux leakage value prediction model learned by machine learning including one or more of surface state parameters of the grain-oriented electrical steel sheet before being subjected to the magnetic domain refining treatment, one or more of environmental condition parameters when being subjected to the magnetic domain refining treatment, and one or more of control parameters of an energy beam when being subjected to the magnetic domain refining treatment, and using the magnetic flux leakage value of the grain-oriented electrical steel sheet after being subjected to the magnetic domain refining treatment as output data.SELECTED DRAWING: Figure 2

The stretching linkage equipment comprises a traction machine and the tension machine, the traction machine comprises a traction machine frame, a traction winding drum and a guide mechanism, the traction winding drum is installed on the traction machine frame, and the guide mechanism is arranged on the traction machine frame; the tension machine comprises a tension machine frame, an output shaft and a tension winding drum, the tension winding drum is rotationally arranged on the tension machine frame, and the output shaft is fixedly connected to the tension winding drum; a hydraulic resistance braking mechanism is fixedly arranged on the tension rack, and the hydraulic resistance braking mechanism is arranged on the output shaft in a sleeving manner; the tension machine further comprises a gear motor, and the gear motor is arranged on the tension machine frame. The hydraulic resistance braking mechanism comprises a liquid disc, a closed liquid cavity filled with magnetorheological fluid is arranged in the liquid disc, a resistance wheel set is arranged in the liquid cavity, and the resistance wheel set comprises a rotatable resistance blade and a motor; and a magnetic field regulation and control mechanism is arranged outside the liquid disc. The technical problem that hydraulic braking of existing stretching equipment fails is solved by integrating the hydraulic resistance braking mechanism and the magnetic domain regulation and control mechanism through the tensioner.

The invention discloses a method and system for detecting the magnetization direction of an unmagnetized magnet, and belongs to the technical field of magnetic material detection. The method comprises the following steps: applying an external guide magnetic field to a to-be-detected non-magnetized magnet; detecting a signal related to the physical state of the non-magnetized magnet under the action of the guide magnetic field as a response signal; and judging the magnetization direction of the non-magnetized magnet based on the corresponding relation between the response signal and the preset magnetization direction. The corresponding system comprises a guide magnetic field generation unit, a detection unit and a discrimination unit. The modulation effect of magnetocrystalline anisotropy of a non-magnetized magnet on an external magnetic field is utilized, invisible magnetic domain orientation information is converted into externally observable physical field difference, efficient, visual and lossless recognition of the preset magnetization direction is achieved, and the method is suitable for production quality control of magnetic assemblies such as a Halbach magnetic circuit and the like.

The invention relates to a regulation and control method and application of Skyrmion in a Pd / Co multilayer film, and the regulation and control method comprises the following steps: preparing a Pd / [Co / Pd] x film on a substrate, x being any integer from 1 to 5; the prepared Pd / [Co / Pd] x film is completely overturned under a 100Oe magnetic field, a single magnetic domain is displayed, then mixed gas of hydrogen and inert gas is introduced, the hydrogen concentration in the mixed gas is gradually increased along with time, and the skyrmion in the film gradually appears and tends to be saturated; and hydrogen supply is stopped, the thin film is placed in air for standing, and the thin film magnetic domain structure recovers to the initial state. The invention also provides an application of the regulation and control method in a high-density nonvolatile memory. Compared with the prior art, by using the reversible diffusion behavior of hydrogen and the modulation effect of an interface electronic structure, the regulation and control range of the skyrmion is widened, the spatial resolution and the operation flexibility are also remarkably improved, and a brand new feasible way is provided for realizing a low-power-consumption and high-stability spin electronic device.

A light high-entropy steel base material with the T0 temperature lower than the room temperature is selected, heat preservation is carried out for 4 hours at the temperature of 1100 DEG C, homogenizing annealing is carried out, then water quenching is carried out after the temperature is kept for 40 minutes at the temperature of 1100 DEG C, a structure containing BCC and FCC double phases is obtained, and at the room temperature, the T0 temperature of the light high-entropy steel base material is kept at the constant temperature of 1100 DEG C for 40 minutes, and the T0 temperature of the light high-entropy steel base material is kept at the constant temperature of 1100 DEG C for 40 minutes. And performing ultrasonic rolling treatment on the surface of the sample. The method has the advantages that BCC-to-FCC martensite inverse phase transformation can be induced on the surface layer of a workpiece, the magnetic domain of the surface layer basically disappears, the strength and plasticity are synchronously improved, and the method can be widely applied to the fields of electrical equipment, MRI devices, nuclear submarine shells, aerospace, automobile key components and the like.

The invention discloses a non-oriented high-silicon steel plate machining method and a non-oriented high-silicon steel plate. The non-oriented high-silicon steel plate machining method comprises the steps that the non-oriented high-silicon steel plate is provided; a laser beam of a laser is guided by water jet, and the non-oriented high-silicon steel plate is cut into a preset size; permanent magnets are symmetrically arranged on the two sides or the rear portion of the laser and used for stabilizing magnetic domains under the action of external magnetic field energy, and the magnetic domains are arranged in the easy magnetization direction. And the cut non-oriented high-silicon steel plate is cooled through water jet, the width of a heat affected zone is reduced, and the machined non-oriented high-silicon steel plate is obtained. According to the method, the high-silicon steel plate with low surface roughness, small residual stress and excellent magnetic performance can be obtained.

The grain-oriented electrical steel sheet is provided with a plurality of magnetic domain control processing lines on the surface, and a rectangular evaluation region in which the length of the side parallel to the rolling direction of the grain-oriented electrical steel sheet is 50 mm and the length of the side parallel to the direction perpendicular to the rolling direction of the grain-oriented electrical steel sheet is 100 mm is set in the grain-oriented electrical steel sheet. When imaginary lines parallel to the direction perpendicular to the rolling direction and having a length of 100 mm are set at a 5 mm interval in a direction parallel to the rolling direction inside the evaluation region, in at least one of the imaginary lines, at least one of the imaginary lines has a length of 100 mm. The average value [beta] L of the absolute values of [beta] angles measured between two magnetic domain control points, which are the intersections of the virtual line and the magnetic domain control line, is 1.5 DEG or more, wherein the standard deviation of the interval between the magnetic domain control points is 1.25 mm or more, and the interval is the maximum value DL.

The grain-oriented electrical steel sheet is provided with a plurality of magnetic domain control processing lines extending in a direction intersecting the rolling direction on the surface, a square evaluation region having one side length of 50 mm and the other side parallel to the rolling direction is set on the surface, and a plurality of magnetic domain control processing lines extending in the direction intersecting the rolling direction are set inside the evaluation region. When virtual lines parallel to the rolling direction and having a length of 50 mm are set at 5 mm intervals in a direction perpendicular to the rolling direction, in at least one of the virtual lines, the maximum value of the interval in the rolling direction between adjacent intersections among a plurality of intersections between the virtual line and the plurality of magnetic domain control processing lines exceeds 20 mm, and the maximum value of the interval in the rolling direction between adjacent intersections among the plurality of intersections among the plurality of magnetic domain control processing lines exceeds 20 mm. And the average magnetic domain width measured along the imaginary line is 600 [mu] m or less.

A method is provided for positioning and orienting a platform such as a sample or workpiece relative to a frame of reference where the platform is a complex magnetic object that contains at least two magnetic domains with non-collinear magnetic moments and the method includes generating a spatially and temporally varying magnetic field so that each magnetic moment of the complex magnetic object interacts with the applied magnetic field. This can be used to performs an operation on a workpiece such as addition or removal of material. This can be used where the object includes a sample and, in each measurement configuration of the sample, radiation transmitted, reflected or scattered is measured from said sample material and analyzed to obtain information about the sample material.

The application provides a chip and a terminal, and can make a chip based on magnetic domain wall logic have a timing function. The chip comprises a magnetic material layer and a conductive layer which are arranged in a stack, the magnetic material layer comprises a first trunk, a second trunk, a first branch and a second branch, and the first branch and the second branch constitute a closed loop. The first branch comprises a first transmission branch, a logic operation branch and a second transmission branch which are connected in sequence, and the second branch comprises a third transmission branch, a feedback branch and a fourth transmission branch which are connected in sequence; the first transmission branch and the third transmission branch are connected with the first trunk, and the second transmission branch and the fourth transmission branch are connected with the second trunk. The line width of the first transmission branch is smaller than that of the third transmission branch, and the line width of the second transmission branch is larger than that of the fourth transmission branch. The conductive layer is used for transmitting current, so that the magnetic domains of the magnetic material layer are alternately moved from the first trunk to the second trunk and from the second trunk to the first trunk.

A magnetic domain wall motion element includes a first ferromagnetic layer, in-plane wiring, and first, second and third via wirings. A position of the in-plane wiring in a stacking direction is different from that of the first ferromagnetic layer. The first via wiring connects the first ferromagnetic layer and in-plane wiring. The second via wiring is connected to the in-plane wiring at a different position from the first. The third via wiring is connected to the in-plane wiring at a different position from the first and second. When positions of the second and the third via wirings are projected on an axis passing through a center of the first via wiring when viewed in the stacking direction and extending in a second direction, the first via wiring is interposed between projection points of the second and third via wirings to the axis in the second direction.

This invention discloses a measurement technique for the width of magnetic domain walls based on a transmission Lorentz electron microscope, comprising the following steps: (1) observing the sample in a transmission electron microscope and obtaining a series of defocus images corresponding to the magnetic domain walls; (2) replacing the sample with a standard sample, obtaining a series of defocus images, and calculating the correction coefficients for magnifications corresponding to different defocus amounts under the current Lorentz imaging mode; (3) selecting a portion of the magnetic domain walls perpendicular to a certain area in a series of defocus images, performing Gaussian linear fitting on the intensity distribution of this area and correcting it to obtain the transverse width of the magnetic domain walls, and then performing linear fitting based on the relationship between the transverse width of the magnetic domain walls and the defocus amount to extrapolate the intrinsic width of the magnetic domain walls; (4) constructing the magnetization distribution of the magnetic domain walls based on the intrinsic width of the magnetic domain walls, simulating a series of Fresnel defocus images of the magnetic domain walls, calculating the correspondence between the width of the magnetic domain walls and the defocus amount, and extrapolating to obtain the width of the simulated magnetic domain walls under positive focus conditions. Using the method of this invention, quantitative measurement of the width of magnetic domain walls in magnetic materials can be achieved.

This magnetic domain information acquisition device acquires magnetic domain information of a magnetic material, and includes an image acquisition unit that acquires a magnetic domain image of the magnetic material, a feature acquisition unit that acquires magnetic feature quantities of the magnetic material, and an acquisition unit that determines, for each region on the surface of the magnetic material, based on image accuracy related information, whether to use the magnetic domain image or the magnetic feature quantities of the magnetic material to acquire the magnetic domain information, and acquires the magnetic domain information of the magnetic material in accordance with the determination.

The application discloses a kind of soft material 4D printing method and device with regionalized magnetic domain direction.The method comprises the following steps: establishing partition three-dimensional model and planning printing path to generate original G code;Based on the preset magnetic domain direction requirement, obtain the driving parameters of multiple magnetic poles by magnetic field model reverse decoupling, and re-edit G code to integrate magnetic field control and UV light control instruction;Prepare UV-curable soft material containing magnetic particles;After setting printing parameters, execute printing, synthesize three-dimensional magnetic field of preset direction at extrusion point when material extrusion makes magnetic particles directional, and delay to open UV light curing to lock magnetic domain direction.The application realizes three-dimensional space regionalization editing of magnetic domain direction inside soft material, significantly improves the deformation design freedom and motion control accuracy of 4D printing product, and provides reliable technical support for integrated manufacturing of complex driven soft robot.

This invention provides a nanoscale spin waveguide based on alternating magnet domain walls, belonging to the field of magnetic device technology. The device comprises, from bottom to top, a substrate, an alternating magnet thin film, and a microwave excitation source. The microwave excitation source excites an alternating magnetic field with a single frequency. The alternating magnetic field interacts with the magnetic moments of the alternating magnet thin film, causing the magnetic moments to precess. This precession is then propagated outward from the microwave excitation source in the form of a wave, forming a spin wave. By reducing the frequency of the alternating magnetic field, the spin wave propagates only within the domain walls of the alternating magnet thin film, realizing an alternating magnet domain wall spin waveguide. This invention reduces the difficulty of spin wave excitation, which is beneficial for reducing device energy consumption. Furthermore, this invention offers advantages in device miniaturization and high efficiency, and can promote the generation and development of spin wave devices based on anisotropic media, possessing broad application prospects.

The invention discloses an anisotropic bonded neodymium-iron-boron magnet and a preparation method, and relates to the technical field of permanent magnet material preparation, the magnet is composed of anisotropic neodymium-iron-boron magnetic powder, a composite binder and a nanometer reinforcing phase, and the surface of the magnet is provided with an Al-Si alloy coating; wherein the composite binder is formed by blending epoxy resin and nylon, and the nano reinforced phase is fumed silica. The preparation method comprises the steps of magnetic powder pretreatment, surface modification, mixing granulation, dynamic magnetic field orientation forming, thermal-magnetic coupling curing and post-treatment. Surface adsorbed water is removed through magnetic powder pretreatment, chemical bonding is achieved through reaction of a silane coupling agent hydrolysis solution and magnetic powder surface hydroxyl groups in surface modification, the modified magnetic powder, a composite binder and a nanometer reinforced phase are subjected to melt blending through mixing granulation, and magnetic powder orientation and densification are achieved through dynamic magnetic field orientation forming through cooperation of a pulsed magnetic field and ultrasonic vibration. The thermal-magnetic coupling curing promotes the crosslinking of the adhesive and inhibits the relaxation of the magnetic domain under the condition of a magnetic field.

A magnetic domain wall movement element according to the present embodiment includes a magnetoresistance effect element that has a reference layer, a nonmagnetic layer, and a magnetic domain wall movement layer in order from a side closer to a substrate; and a first magnetization fixed layer and a second magnetization fixed layer which are each in contact with the magnetic domain wall movement layer and are separated from each other, wherein the magnetic domain wall movement layer includes a plurality of ferromagnetic layers and a plurality of insertion layers sandwiched between the plurality of ferromagnetic layers, wherein the ferromagnetic layer contains Co and Fe and has perpendicular magnetic anisotropy, and wherein, when writing is performed, a write current is allowed to flow between the first magnetization fixed layer and the second magnetization fixed layer along the magnetic domain wall movement layer.

A processing device (200) derives, based on the result of comparison of a region to be compared with a template image (410), magnetic domain information at a pixel to be compared (520) in the region to be compared (510).

A quantum device including a ferromagnetic link having a ferromagnetic material, a first superconducting layer, and a second superconducting layer configured to be coupled with the first superconducting layer by the ferromagnetic link, the quantum device being configured to have a resonant frequency that is tunable based on a position of a domain wall of the ferromagnetic link, and, to reproduce a predetermined resonant frequency of the quantum device, the ferromagnetic link includes a marking point corresponding to the predetermined resonant frequency.

The application provides a conformal tactile sensor based on giant magnetoelastic effect and a preparation method thereof, and aims to solve the technical problem that the existing flexible tactile sensor is difficult to realize high-resolution perception of small static force and perfect conformal fitting of a bionic three-dimensional curved surface at the same time. The sensor adopts a multi-layer flexible continuum structure, and the bionic curved surface contact layer with spatial topological texture, the giant magnetoelastic sensing layer with directionally distributed high magnetoelastic material, and the 3D conformal coil excitation and receiving layer based on the flexible printing process are sequentially arranged from outside to inside. The application breaks through the dependence of the traditional magneto-mechanical coupling mechanism on the macroscopic displacement of the elastic body, and innovatively uses the local magnetic permeability mutation caused by the contact stress driving the internal magnetic domain deflection, combined with the active alternating bias magnetic field, to realize the continuous and high-sensitivity capture of the small static clamping force and the dynamic slip signal. The sensor has broad industrialization prospects in the application fields of embodied robots such as underwater operation, fine object grasping and complex human-computer interaction.

A magnetic field-assisted additive manufacturing (MFAAM) system and method for fabricating anisotropic bonded magnets. The system includes a magnetic field source assembly including a modular Halbach holder, an inner Halbach holder, and a Halbach cylinder configured to provide a magnetic field for aligning magnetic fillers within a polymer matrix during extrusion. The field gradient of the Halbach cylinder is less than 0.0005 T / mm allowing to obtain high print quality in a large magnetic field. To enable high-temperature processing, the assembly incorporates a cooling casing fluidly coupled to a cooling medium. This active thermal management maintains the Halbach cylinder below a threshold temperature while a heated nozzle extrudes the composite material at temperatures sufficient to melt high-performance polymers. The integration of the magnetic source and cooling jacket allows for the precise alignment of magnetic domains in high-viscosity matrices, resulting in 3D-printed bonded magnets with consistent magnetic anisotropy and improved structural properties.

The application relates to a magneto-optical Kerr measurement device and a method for acquiring a magnetic domain wall image. The magneto-optical Kerr measurement device comprises a magneto-optical Kerr microscope, wherein the magneto-optical Kerr microscope comprises an ocular lens and a CMOS camera; and an event camera, wherein the event camera comprises an underlying chip, the event camera is arranged on the ocular lens of the magneto-optical Kerr microscope, and the event camera is in a confocal plane with the CMOS camera. The method is to acquire a magnetic domain wall image by using the event camera in the magneto-optical Kerr measurement device. The application can improve the rapid detection of the magnetic material, has high resolution, is simple to operate, and has important significance for the research and development of the magnetic material.

A device is provided that includes a semiconductor substrate on which a free magnetic element is positioned, which has first and second magnetic domains separated by a domain wall. A first magnet is positioned on the substrate near a first end of the free magnetic element, and has a first polarity and a first value of coercivity. A second magnet is positioned on the substrate near a second end of the free magnetic element, and has a second polarity, antiparallel relative to the first polarity, and a second value of coercivity different from the first value of coercivity.

The invention provides a TMR sensor based on an annular free layer. Belongs to the technical field of sensors, and comprises a reference layer, a barrier layer and an annular free layer, and by constructing a topologically constrained annular magnetic domain structure, controllable deflection of the magnetic moment of the free layer under the action of an external magnetic field and accurate relative orientation with the reference layer are realized, so that the linear response performance of a magnetic tunnel junction (MTJ) is improved. The effective anisotropic field is reduced by adjusting geometric parameters (such as width-to-thickness ratio and internal and external diameter ratio) of the annular free layer, and the expansion of a linear response interval is realized; meanwhile, the annular structure forms a magnetization closed path, so that demagnetization factors and stray fields are effectively reduced, and the sensitivity and the anti-interference capability are improved. The sensor is prepared by combining magnetron sputtering with a micro-nano patterning process, and magnetic anisotropy is enhanced through magnetic annealing treatment. The sensor is simple in structure, excellent in performance and suitable for high-precision magnetic field detection scenes.

Provided is a grain-oriented magnetic steel sheet having both low iron loss and low magnetostriction. The grain-oriented magnetic steel sheet has a heat-strained region extending in a direction transverse to a rolling direction, and has closed magnetic domains in the heat-strained region. The heat-strained region has maximum points of tensile strain on both sides of the closed magnetic domains in the rolling direction. In a strain distribution in the rolling direction of the heat-strained region, the strain on both sides of the closed magnetic domains is a tensile strain greater than the strain at the center between the maximum points.

This invention relates to the field of track inspection technology, and in particular to a method and system for detecting track defects based on magneto-optical sensing. The method includes: emitting high-brightness linearly polarized light onto the train track under high-speed train operation conditions; the linearly polarized light undergoing polarization angle rotation due to the interaction between the magneto-optical sensing medium and the local magnetic field of the abnormal track section, wherein the magneto-optical sensing medium and the abnormal track section are non-contactly coupled; acquiring polarization rotation information and converting it into an observable light intensity change signal; collecting the light intensity change signal and forming a magneto-optical image; performing polarization analysis and magneto-optical anomaly reconstruction on the magneto-optical image to convert it into a magneto-optical anomaly field with spatial distribution characteristics; and determining the defects in the abnormal track section based on the magneto-optical anomaly field. This invention transforms the invisible magnetic domain anomalies induced by internal stress in the track steel into a visible magneto-optical anomaly field through magneto-optical sensing, achieving non-contact detection of surface and subsurface cracks.

The invention discloses a ferromagnetic metal material average grain size characterization method based on magnetic domain motion characteristics, which comprises the following steps: firstly, preparing a sample for EBSD method material characterization and multi-magnetic detection equipment detection; secondly, carrying out quantitative characterization on the average grain size of the sample based on EBSD method material characterization; then, performing electromagnetic nondestructive testing on the ferromagnetic metal material based on a multi-magnetic testing device to obtain electromagnetic signals representing reversible and irreversible motion of a magnetic domain, and defining and extracting corresponding electromagnetic characteristic parameters of the ferromagnetic metal material at the same time; and finally, by analyzing the relationship between the electromagnetic characteristic parameters and the characteristic microstructure, screening out the electromagnetic characteristic parameters as input, and establishing and adjusting a deep neural network representation model of the characteristic microstructure based on the electromagnetic characteristic parameters of the magnetic domain reversible and irreversible motion. According to the invention, nondestructive testing of the average grain size of the ferromagnetic metal material is realized.

A stator for an axial flux motor includes: a yoke, a plurality of teeth arranged on the yoke and spaced from each other, each tooth of the plurality of teeth including a sprayed soft-magnetic composite material including a matrix of ferro-magnetic domains separated by insulation layers, and a coil over each tooth, the coil over each tooth being connected to coils on adjacent teeth. Each tooth of the plurality of teeth includes a body portion having three sides, each of the three sides having a bottom edge and a top edge, and a top portion located on the top edges. The top portion includes an overhang portion that overhangs the top edges of the body portion. Each tooth of the plurality of teeth provides for a magnetic flux flow in the spray-formed composite material in axial, radial, and circumferential directions.