314 results about "Magnetism" patented technology

The invention discloses a reweighted inversion method and system for a magnetic anomaly modulus under a residual magnetism condition and a storage medium, and belongs to the technical field of magnetic exploration, and the method comprises the following steps: converting the magnetic anomaly modulus to obtain the magnetic anomaly modulus; carrying out nonlinear forward modeling on the magnetic anomaly modulus; and linearizing a forward modeling formula of the magnetic anomaly modulus, constructing a reweighted minimum model objective function, solving the reweighted minimum model objective function, finally obtaining the magnetization intensity of an inversion space, and delineating a target geologic body. According to the scheme, the nonlinear forward modeling formula of the magnetic anomaly modulus is subjected to linear representation, and the sensitivity matrix serving as depth weighting is further updated by utilizing the magnetic anomaly modulus kernel function matrix updated along with iteration, so that the reweighting minimum model objective function is constructed, the precision of magnetic anomaly modulus inversion under the residual magnetism condition is improved, and the accuracy of the magnetic anomaly modulus inversion under the residual magnetism condition is improved. And a more reliable inversion result is provided for more accurate depiction of a deep magnetic structure, mineral resource exploration and the like.

The invention relates to the technical field of magnetic separation, in particular to a magnetic gradient separation fire metal material evidence screening machine and a multistage magnetic field regulation and control method thereof.The magnetic gradient separation fire metal material evidence screening machine comprises a machine body, a feeding pipe and rotating cylinders are rotationally connected to an inner cavity of the machine body, magnetic separation assemblies are installed between the feeding pipe and the rotating cylinders and between the two rotating cylinders, and driven gears are installed on the outer walls of the feeding pipe and the rotating cylinders; according to the multi-stage magnetic separation device, the multi-stage magnetic separation design is adopted, magnetic force sequentially increased from top to bottom of the magnetic separation assembly is combined with centrifugal force generated by rotation of the feeding pipe and the rotating cylinders, and materials are evenly dispersed and make full contact with the magnetic separation assembly; meanwhile, the valve plate assemblies are sequentially opened in the descending process of the abutting blocks, so that the materials sequentially fall down layer by layer, sorting disorder caused by falling of a large number of materials at a time is avoided, the materials can be kept for enough time on each magnetic separation assembly, it is ensured that metal material evidences with different magnetisms are fully adsorbed, and the screening accuracy is greatly improved.

The present invention provides a flywheel energy storage flux adjustable induction motor and its magnetic adjustment method, wherein the motor comprises two permanent magnets with different coercive forces and a DC magnetic adjustment winding. A square wave pulse is input into the DC magnetic adjustment winding to generate a magnetic adjustment magnetic field, so that the residual magnetism of the low-coercive force permanent magnet changes in magnitude or direction, thereby realizing rapid adjustment of the motor air gap flux. When the motor is working, the DC magnetic adjustment winding is disconnected, and the residual magnetic flux generated by the high-coercive force permanent magnet and the low-coercive force permanent magnet enters the air gap in parallel to provide excitation flux for the motor; when the motor is on standby, a negative square wave pulse is input into the DC magnetic adjustment winding to generate a magnetic adjustment magnetic field that can reversely saturate magnetize the low-coercive force permanent magnet, so that the low-coercive force permanent magnet is reversely magnetized, and the residual magnetic flux of the high-coercive force and low-coercive force permanent magnets is equal in magnitude and opposite in direction, so that the air gap flux is reduced to 0, thereby eliminating standby iron loss. In addition, the DC magnetic adjustment winding can also be used as a backup excitation source to prevent the risk of permanent magnet demagnetization.

The invention relates to a method for dynamically eliminating residual magnetism of an iron core of a converter transformer, and belongs to the field of transformer demagnetization. According to the method, a capacitance energy storage and release device is connected to the two ends of a transformer winding, capacitance energy storage causes RLC oscillation of the transformer, a magnetic field is generated through current caused by the RLC oscillation, and magnetic domains of iron core ferromagnetic materials are rearranged through the changed magnetic field, so that the demagnetization effect on residual magnetism of the transformer is achieved. The method comprises the following steps: drawing a hysteresis loop in the demagnetization process of a transformer by collecting voltage and current data in the demagnetization process, translating an end point of the hysteresis loop to an original point, and judging the residual magnetism direction and size of initial demagnetization according to the area of each quadrant of the hysteresis loop; and then transformer demagnetization is carried out again, the residual magnetism direction and size of the first demagnetization are evaluated according to the hysteresis loop of the second demagnetization, and whether the residual magnetism is smaller than a threshold value is judged. According to the method, the direction and size of residual magnetism in the demagnetization process can be evaluated in real time, the demagnetization energy is dynamically adjusted, and sufficient demagnetization of the converter transformer is ensured.

A treatment method for enhancing coercive force of neodymium iron boron magnet includes the following steps: subjecting the neodymium iron boron magnet to electrochemical deposition in a diffusion water-based solution to obtain a neodymium iron boron magnet containing a heavy rare earth; and subjecting the neodymium iron boron magnet containing the heavy rare earth to heat treatment to complete enhancement of the coercive force of the neodymium iron boron magnet. The raw material used in the present invention is cheap heavy rare earth compounds which increases the selection of diffusion sources and lowers costs. Metal alloy particles are mainly obtained in a nanoscale size and can effectively enter crystal grains, and low-melting-point metal alloy components can enhance a demagnetizing coupling effect between main phase grains. According to the present invention, the coercive force of the magnet is increased by nearly 30%, and residual magnetism is almost not changed.

The invention discloses a method for measuring and analyzing residual magnetism characteristics of an iron core. According to the method, a to-be-detected iron core is demagnetized, preset residual magnetism is set, direct-current voltage excitation with opposite polarities, the same amplitude and the same duration is applied to a primary winding of the to-be-detected iron core, and transient current response signals are synchronously collected; two groups of current under positive / negative polarity excitation are extracted, and the residual magnetism direction is judged by comparing the change rate of the current; a curve of equivalent resistance changing along with time is calculated based on forward current and voltage, a resistance value corresponding to a characteristic inflection point moment is selected, the resistance value is substituted into a pre-established residual magnetism-equivalent resistance empirical formula to deduce the magnitude of residual magnetism, and a matched iron core residual magnetism detection and demagnetization integrated system integrates information management, residual magnetism detection, demagnetization and display modules. And closed-loop automation of detection, analysis and demagnetization is realized. According to the method, a magnetic field sensor is not needed, the residual magnetism direction and size can be synchronously obtained in a high-precision and robust mode only through port electric signals, and the method is suitable for on-site off-line or live detection.

The utility model relates to the technical field of nucleic acid extraction, and particularly discloses a magnetic rod stirring sleeve assembly and a nucleic acid extractor. The magnetic rod stirring sleeve assembly comprises a magnetic rod and a magnetic rod base, a plurality of magnetic suction seats with magnetism are arranged on the magnetic bar base; the magnetic bar is connected to the magnetic suction seat in a magnetic suction manner; the magnetic attraction base is used for generating magnetic traction force to the magnetic bar so that the magnetic bar can be perpendicular to the magnetic bar base. According to the scheme, through magnetic attraction cooperation of the magnetic attraction base and the magnetic bar, the magnetic bar can be finely adjusted in the horizontal position so as to adapt to stirring sleeves of different sizes; meanwhile, in the process that the magnetic bar is arranged in the stirring sleeve and in the stirring process of the stirring sleeve, the magnetic attraction base can continuously provide magnetic traction force for the magnetic bar to ensure the perpendicularity of the magnetic bar, the deviation of the magnetic bar and the center position of the stirring sleeve is reduced, and therefore the effect of improving the nucleic acid extraction quality is achieved.

A magnetic sensor according to the present invention is capable of measuring a small magnetic field with high accuracy by eliminating 1 / f noise. The magnetic sensor comprises a variable magnetic field detection unit that includes a Hall element having a magnetism-sensing direction giving rise to an anomalous Hall effect and a magnetic field control unit for controlling the Hall element so that a magnetic field having a component in a non-sensing direction orthogonal to the magnetism-sensing direction is generated in the Hall element. The magnetic sensor may further comprise a magnetic field calculation unit that calculates a measurement magnetic field on the basis of a first output and a second output, the first output including a measurement result obtained when the variable magnetic field detection unit measures a measurement magnetic field along the magnetism-sensing direction in a first state in which the direction of the magnetic field generated in the Hall element is not controlled by the magnetic field control unit, the second output including a measurement result obtained when the variable magnetic field detection unit measures the measurement magnetic field in a second state in which the direction of the magnetic field generated in the Hall element is controlled by the magnetic field control unit.

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a grain boundary diffusion magnet based on a hard magnetic 6: 14 phase and a preparation method of the grain boundary diffusion magnet. Preparing a diffusion source, and loading the diffusion source on the surface of the matrix magnet; carrying out heat preservation diffusion under the environment pressure of which the vacuum degree is less than or equal to 10 <-2 > Pa; and carrying out aging treatment to obtain the grain boundary diffusion magnet based on the hard magnetic 6: 14 phase. The grain boundary phase of the prepared grain boundary diffusion magnet based on the hard magnetism 6: 14 phase is mainly the continuous 6: 14 phase, the hard magnetism is presented, the coercive force is improved, meanwhile, the residual magnetism is prevented from being reduced, the problems that the coercive force of an existing neodymium-iron-boron magnet is improved in a limited mode, and the residual magnetism cannot be prevented from being reduced are solved, and the service life of the neodymium-iron-boron magnet is prolonged. The invention provides a low-cost high-comprehensive-magnetic-performance grain boundary diffusion magnet preparation method.

The invention discloses an overlying strata fracture electromagnetic imaging method and a grouting system, and particularly relates to the technical field of geological fracture imaging. The invention discloses an overlying strata fissure electromagnetic imaging method and a grouting system. The method comprises the steps that S1, magnetic source slurry containing permanent magnetic material particles is injected into a target overlying strata fissure area through the grouting system; s2, magnetizing the magnetic source slurry injected into the crack through an electromagnetic coil group arranged on the grouting system; s3, tracer slurry containing magnetic responsive nanoparticles is injected into the fissure area where the guiding magnetic field is formed through a grouting system; s4, in-hole electromagnetic detection equipment is adopted to scan the fracture area filled with the tracing slurry, and electromagnetic response data are obtained; and S5, processing and analyzing the electromagnetic response data. According to the overlying strata fissure electromagnetic imaging method and the grouting system provided by the invention, through a technical path of'pilot magnetism and post tracing ', the tracing slurry is actively guided to directionally migrate by utilizing the magnetic field, and high-precision filling and electromagnetic imaging of an overlying strata fissure network are realized.

The invention relates to the technical field of superconducting material performance test instruments, and discloses a static and dynamic superconducting block magnetic force test board and a test method.The test board comprises a mechanical motion system, and the mechanical motion system is composed of a base, a shell, a horizontal ball screw and a vertical ball screw; the horizontal ball screw, the vertical ball screw and the shell are all fixed at the upper end of the base, and the dynamic vibration excitation device comprises an electric vibration exciter which is fixed at one side of a vertical ball screw movable table and is used for applying vibration to the superconducting block to be tested so as to suppress magnetic attenuation; and one side of the annular track is provided with a clamping assembly, and the clamping assembly is used for fixing the superconducting block to be tested. According to the static and dynamic superconducting block magnetic force test board and the test method, three-dimensional magnetic force synchronous measurement of the superconducting block under static and dynamic working conditions can be realized, the limitation that traditional equipment only limits single-axis static test is overcome, and the magnetic influence of a real continuous alternating magnetic field on the superconducting block is simulated.

The invention discloses a cerium-containing high-abundance rare earth sintered neodymium iron boron permanent magnet which does not contain heavy rare earth and does not need a grain boundary diffusion process and a preparation method thereof. The magnet is formed by crushing and mixing three alloy casting pieces, the three alloy casting pieces are an Nd / Pr-rich phase, a Ce-La-rich phase and a Y-Nd-rich phase respectively, and Ce accounts for more than or equal to 30wt% of the total amount of all rare earth elements; the trace elements (Al, Cu, Ga, Nb, Zr and the like) are uniformly introduced in the smelting stage of each main phase, and grain boundary reconstruction is induced through in-situ hydrotreating to form a thin and continuous rare earth-rich grain boundary phase; and after orientation compression molding, vacuum sintering and multi-stage heat treatment, a sintered magnet with excellent magnetic performance is obtained. According to the product, the intrinsic coercive force Hcj is larger than or equal to 15 kOe, the residual magnetism Br is larger than or equal to 13.7 kG, and the maximum magnetic energy product (BH) max is larger than or equal to 39 MGOe. The problems that a high-Ce magnet is low in coercive force, discontinuous in grain boundary phase and the like are solved, the method does not need to depend on Dy / Tb heavy rare earth and a grain boundary diffusion technology thereof, the cost is reduced by 30% or above, and the method is suitable for the fields of new energy automobiles, wind power generation and the like and has a good industrialization prospect.

The invention relates to the technical field of preparation of neodymium-iron-boron materials, and discloses a high-performance neodymium-iron-boron material and a preparation method thereof, and the high-performance neodymium-iron-boron material realizes efficient permeation of heavy rare earth elements along a specific path through a grain boundary network pre-construction and gradient diffusion technology in combination with a hydrogen decrepitation and surface activation process, so that the coercive force and thermal stability of a magnet are remarkably improved. An alternating magnetic field assisted sintering and dynamic tempering process is innovatively adopted, and a magnetic field-lattice coupling effect is utilized to release microscopic stress, so that magnetic performance attenuation in a high-temperature environment is effectively inhibited. A surface protection system is fused with a grain boundary modification and composite coating technology, a multistage corrosion-resistant barrier is constructed through the synergistic effect of an intermetallic compound layer and a nano coating, and the service life of the magnet in a severe environment is greatly prolonged. According to the method, the bottleneck of mutual restriction of performance indexes in a traditional process is broken through, and collaborative optimization of coercive force strengthening, temperature stability improving and corrosion resistance is achieved on the basis of keeping the high residual magnetism characteristic.

The invention discloses a method for regulating and controlling magnetic anisotropy of a Cr-based MXene material through charges. The method comprises the following steps: synthesizing an MAX precursor; the MAX precursor is subjected to etching and stripping, and a single-layer Cr-based MXene nanosheet is obtained; on the basis of a single-layer Cr-based MXene nanosheet, a substrate, an electrode and ionic liquid are used for synthesizing and regulating a Cr-based MXene material charge-doped ionic liquid gate structure. The method has the remarkable effects that the magnetic anisotropy (MAE) of the Cr2TiC2O2 material is improved through charge doping, the magnetic easy axis direction is regulated and controlled, the magnetism and the magnetic phase change can be accurately regulated, the magnetic order temperature of the material is remarkably improved, and the application potential of the material in a high-temperature environment is widened.

This invention discloses neodymium iron boron (NdFeB) magnets, their preparation methods, and applications. In the NdFeB magnets: the content of heavy rare earth elements (Tb) in the first, second, third, and fourth easily demagnetized regions is the same; the content of heavy rare earth elements in the first, second, third, and fourth transition regions is the same; the Tb content ratio of the non-easily demagnetized region to the first easily demagnetized region is (0-0.9):1; the Dy content ratio of the first easily demagnetized region to the non-easily demagnetized region is (0-0.9):1; and the Tb content ratio of the first transition region to the first easily demagnetized region is (0.8-1):1. The NdFeB magnets of this invention can reduce the attenuation of surface magnetism and magnetic flux while maintaining remanence, exhibiting good anti-demagnetization performance.

The present invention provides a single-phase multiferroic material, a single-phase multiferroic thin film, and their preparation methods and applications. The chemical formula of the single-phase multiferroic material is Dy 0.5 Ba 0.5 TiO3. A single-phase multiferroic thin film, the components of the thin film include Dy 0.5 Ba 0.5 TiO3, and the preparation method is as follows: preparing a Dy 0.5 Ba 0.5 TiO3 target by a solid-phase reaction method; using the Dy 0.5 Ba 0.5 TiO3 target as the target, using argon as the sputtering gas, and using a radio frequency power supply to perform magnetron sputtering on a single crystal substrate to obtain a single-phase multiferroic thin film. In the single-phase multiferroic material Dy 0.5 Ba 0.5 TiO3 of the present invention, the ferroelectric polarization and magnetism in the material are homologous and are both induced by magnetism, enhancing the magnetoelectric coupling effect in the material.

The invention discloses a sintered neodymium-iron-boron permanent magnet material with a low coercive force temperature coefficient for a new energy automobile, and relates to the technical field of sintered neodymium-iron-boron permanent magnet materials. Collaborative optimization of high residual magnetism and high coercive force is realized through preparation of the sintered neodymium-iron-boron permanent magnet material; the performance bottleneck of a traditional sintered neodymium-iron-boron magnet material is broken through, and the energy density and the demagnetization resistance of the magnet are doubly improved, so that the magnet is excellent in high-temperature and high-intensity magnetic field environments.

The invention discloses a magnetizing inrush current suppression method and system based on iron core residual magnetism tracking, relates to the technical field of electronic power, and solves the problem that it is difficult to perceive transformer iron core residual magnetism in real time. According to the embodiment of the invention, the residual magnetic flux of the iron core is calculated through the recording data, and the real-time sensing of the residual magnetism of the transformer iron core is realized; and then a dynamic risk index is calculated based on the residual magnetic flux of the iron core and whether a high-risk inrush current exists or not is judged based on the odd harmonic clustering degree of the closing current of the transformer, so that the current magnetizing inrush current risk of the transformer can be more accurately judged, and the magnetizing inrush current risk is effectively inhibited.

The invention discloses a preparation method of a ferromagnetic annular rubber magnet, which comprises the following steps: providing a sheet material of the rubber magnet, and cutting the sheet material into strips to form a plurality of rubber magnetic strips; performing primary cold pressing treatment on the rubber magnetic strip, so that the two ends of the rubber magnetic strip are jointed to form a conical annular magnet; performing secondary cold pressing treatment on the conical annular magnet to form an annular magnet; and carrying out hot-pressing vulcanization, cooling shaping and magnetizing on the annular magnet in a high-intensity magnetic field to realize special magnetic circuit magnetization so as to obtain the ferromagnetic annular rubber magnet. According to the preparation method, the annular rubber magnet which is high in raw material utilization rate and has strong magnetism can be prepared.

The invention provides a spacecraft magnetic moment measurement method and system based on a four-point method, and the method comprises the steps: controlling a spacecraft to rotate a circle after a plurality of magnetometers are radially arranged at the geometric center height of the spacecraft, and measuring the magnetic intensity values corresponding to four preset measurement points through the plurality of magnetometers; calculating a plurality of key magnetic moment values according to the magnetic intensity values and the measurement spacing values corresponding to the four measurement points; based on the multiple key magnetic moment values, the magnetic core height of the spacecraft is obtained through calculation; adjusting the arrangement height of the plurality of magnetometers to the magnetic core height of the spacecraft; and controlling the spacecraft to rotate for a circle, and obtaining a magnetic moment measurement value of the spacecraft according to the magnetic intensity readings corresponding to the magnetic core heights of the plurality of magnetometers. According to the scheme provided by the invention, the equatorial plane positioning basis of the near-field method can be adjusted from the geometric center of the spacecraft to the magnetic core, the magnetic moment is accurately measured under the condition that the magnetism in the spacecraft is relatively dispersed, and the measurement precision and reliability of the magnetic moment of the spacecraft are improved.

This application belongs to the field of geophysical magnetic exploration, and specifically discloses a method and device for reducing the pole of complex magnetic anomaly data containing remanent magnetism. The method includes: obtaining geophysical magnetic measurement data of underground magnetic bodies; using the frequency domain processing method to convert the geophysical magnetic measurement data into regularized magnetic source intensity, and determining the horizontal position of the magnetic source center according to the maximum value of the regularized magnetic source intensity; performing integral calculation according to the geophysical magnetic measurement data to obtain the integral result of the magnetization characteristics, and obtaining the global total magnetization direction according to the integral result; obtaining the total magnetization direction of the magnetic body according to the horizontal position of the magnetic source center and the global total magnetization direction; performing pole reduction processing with variable magnetization direction on the geophysical magnetic measurement data according to the total magnetization direction to obtain the pole-reduced field of the complex magnetic anomaly data containing remanent magnetism. Through this application, the accuracy of the total magnetization direction can be improved, and the problem of pole reduction of the remanent magnetism anomaly in the case of multiple field sources can be solved.

The invention provides samarium-iron-nitrogen magnetic powder and a preparation method and application thereof, the samarium-iron-nitrogen magnetic powder comprises a first samarium-iron-nitrogen particle, the surface of the first samarium-iron-nitrogen particle is provided with at least one step structure, and each step structure comprises at least two layers of steps. The surface of the first samarium-iron-nitrogen particle is of a step structure, the first samarium-iron-nitrogen particle is high in density, few in crystal defect and high in intrinsic coercive force, and when the samarium-iron-nitrogen magnetic powder comprising the first samarium-iron-nitrogen particle is applied to preparation of a magnet, the residual magnetism and the intrinsic coercive force of the magnet can be improved, and the service life of the magnet can be prolonged.

The invention discloses a three-dimensional magnetic sensor based on an abnormal Hall effect, and belongs to the technical field of spin electron sensors. The three-dimensional magnetic sensor comprises a substrate, an AHE thin film material layer with PMA, a rare earth material layer, a protective layer and a metal electrode layer which are sequentially arranged from bottom to top, the AHE thin film material layer with PMA is of a Pt / Co / Pt multi-layer thin film heterostructure, and the rare earth material layer is Dy. According to the three-dimensional magnetic sensor based on the abnormal Hall effect provided by the invention, a rare earth material Dy layer with a proper thickness grows on a Pt / Co / Pt structure, Co and Dy form antiferromagnetic coupling based on RKKY interaction, residual magnetism adjustment driving current and power consumption are reduced, so that magnetic hysteresis is reduced, and the driving current and power consumption are correspondingly reduced; and the existence of RKKY interaction does not change the multilayer film PMA, so that the linear range is kept unchanged.

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a high-performance cerium-rich magnet based on Laves phase regulation and a preparation method of the high-performance cerium-rich magnet. A preparation method of a high-performance cerium-rich magnet based on Laves phase regulation and control comprises the following steps that S1, main alloy magnetic powder is prepared, specifically, the main alloy magnetic powder with the component being (R < 1-x > Cex) < y > FebalCozTuBw is prepared, and R is one or more of rare earth elements Nd, Pr, Dy, Tb, Y, La and Gd; according to the preparation method of the high-performance cerium-rich magnet based on Laves phase regulation and control, the main alloy magnetic powder and the auxiliary alloy powder are subjected to component design, the cerium-rich magnet is subjected to grain boundary reconstruction, the magnetism and the distribution pattern of the Laves phase in the cerium-rich magnet are regulated and controlled, the magnetic coupling effect among main phase grains is weakened, the coercive force of the magnet is improved, and meanwhile the temperature stability of the magnet is improved; the technical problem that the coercive force and the temperature stability of a cerium-rich magnet are reduced due to the fact that the cerium content is increased is solved.

To provide a magnetic shield device for shielding magnetism from the outside, which maintains a low magnetic field environment in the magnetic shield device (magnetic shield space) and reduces a fluctuation amount of a magnetic field by suppressing temperature fluctuation of the magnetic shield device itself causing magnetic field fluctuation (maintaining temperature stability).SOLUTION: The magnetic shield device 1 includes two or more layers of magnetic shield members 11,12, a thermally conductive member 13 which can accommodate a magnetic sensor and a test object therein, is disposed outside the innermost magnetic shield member 11, and is in thermal contact with substantially the entire surface of the innermost magnetic shield member 11, and a thermally conductive member temperature stabilizing means (here, a constant-temperature fluid 14, a constant-temperature fluid passage 15, a constant-temperature fluid delivery function, and a heat insulating layer 19) for maintaining the thermally conductive member 13 at a constant temperature.SELECTED DRAWING: Figure 2

The invention relates to the field of magnetic field detection, and discloses a method for integrally detecting a three-dimensional vector magnetic field based on excitation and reading, a spin-orbit torque device sensor is adopted, a ferromagnetic material of the sensor has zero residual magnetism and perpendicular magnetic anisotropy, and the method comprises the following steps: applying excitation current to the sensor, and reading output voltage at the same time; obtaining R-H curves of an independent x-direction magnetic field, an independent y-direction magnetic field and an independent z-direction magnetic field; the sensor is placed in a magnetic field to be measured, information of each component of a magnetic field vector is solved through operation by changing the polarity and direction of pulse current, and the size and direction of an unknown magnetic field are obtained according to three components obtained in three directions. Under the combined action of the spin-orbit torque in the sensor, the anisotropic field of the magnetic layer of the zero-remanence magnet, the demagnetizing field and the applied external magnetic field, the write-in and read operations are completed at the same time under the driving of the pulse current, and the function of rapidly and accurately measuring the three-dimensional magnetic field by a single device can be realized.

The application provides a magnet device and a magnetron sputtering cathode with reduced edge magnetic leakage, and relates to the technical field of magnetron sputtering. By adjusting the total residual magnetism ratio of the inner magnet and the outer magnet, the magnetic field distribution is improved, the edge magnetic leakage is reduced, the target material utilization is improved, the chamber pollution and the equipment maintenance frequency are reduced, and finally the use cost is reduced.

To provide a magnetic sensor that makes it possible to measure a small magnetic field with high sensitivity, and that can contribute to downsizing.SOLUTION: Provided is a magnetic sensor 1 characterized by including a variable magnetic field detection part 100a including: a magnetoresistance effect element 10a having a first layer 13 which can be magnetized in a direction along a measurement magnetic field, a second layer 11 capable of maintaining the magnetization direction in a first direction (X direction), and a non-magnetic layer 12 located between the first layer 13 and the second layer 11; and a magnetization control part 20 for reversibly reversing the direction of magnetization 11 m of the second layer 11. The magnetization control part 20 can be an energizing magnetization control part 201 with which the magnetization direction is reversed by energization, and can have a spin torque generation part 21 and an anisotropy variable part 22. The magnetization control part 20 can have the spin torque generation part 21, in which the second layer 11 can be a variable second layer 111, or the second layer 11 can be integrated with the magnetization control part 20 to form an energizing variable second layer 112.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of magnetic measurement testing, and particularly relates to an implementation method of a multi-layer magnetic field coil, which can realize the consistency of the side-to-side ratio of different layers of coil windings. According to the implementation method of the multi-layer magnetic field coil, along with the increase of the number of winding layers, the edge-to-edge ratio of the multi-layer magnetic field coil can be kept unchanged all the time, it is ensured that the technical performance of the magnetic field coil is kept unchanged, and the consistency of the edge-to-edge ratios of different layers of coil windings is achieved.

The invention provides a layered Van der Waals material with full-compensation ferrimagnetism and a topological Hall effect as well as a preparation method and application of the layered Van der Waals material. The chemical formula of the material is MnxCrTe2, wherein 0 lt; and x is 1. The material provided by the invention has a wide compensation temperature range, a large magnetoresistance effect, anisotropy and a topological Hall effect, is a CrTe2 intercalation ferromagnetic material doped in different proportions, and can realize optimization and continuous adjustability of performances such as magnetism, Curie temperature and Hall parameters of the material through regulation and control of mechanisms such as the doping proportion, the temperature and the magnetic field; and a material basis is provided for researching the application of the Mn intercalation CrTe2 crystal material in the field of magnetic induced storage.