40 results about "Magnetic moment" patented technology

A high-power, high-temperature-stability M-type strontium ferrite belongs to the field of ferrite material preparation technology. The ferrite comprises a main formulation of SrCO3, La2O3, CaCO3, MnO, SnO2, Fe2O3, and Co2O3, and additives composed of CaCO3, SiO2, H3BO3, and La2O3. This invention introduces Sn-Mn ions for co-substitution, thereby constructing a Sn... 4+ -Mn 2+ The charge balance mechanism effectively suppressed the Fe ionization induced by the introduction of high-valence ions. 3+ To Fe 2+ Price change behavior, effective compensation after replacement due to the introduction of non-magnetic Sn 4+ This results in a loss of lattice magnetic moment. Simultaneously, through a stepped pre-sintering and sintering process, a CoFe2O4 hard magnetic spinel phase is induced to precipitate in the M-type strontium ferrite main phase. The negative coercivity temperature coefficient of the CoFe2O4 phase complements the inherent positive temperature coefficient of the matrix.

The application belongs to the technical field of spintronics, and specifically forms a vortex of electron drift velocity at the interface of a magnetic layer and a metal layer by a difference in conductivity, further utilizes a spin vortex coupling effect to realize conversion of charge current to spin current, and thereby drives a magnetic moment to flip through a spin-orbit moment. As an example, the application deposits a Cu layer with high conductivity on a PtCo alloy layer with lower conductivity through magnetron sputtering, and constructs a heterostructure with a PtCo / Cu interface spin vortex coupling effect. By increasing the thickness of the Cu layer to improve the conductivity of the Cu layer, a significant improvement in the orbital moment efficiency can be observed. Not only does this provide valuable experimental evidence for in-depth understanding of the physical mechanism of interface-induced spin current, but also enriches the conversion approach between charge current and spin current, and opens up a simple and efficient new path for the research and design of a new generation of spintronic devices.

The application belongs to the field of material calculation simulation, and relates to a prediction method for magnetic coupling evolution characteristics of two-dimensional Janus materials based on first principles. The technical problem to be solved is that the existing technology fails to uniformly analyze the magnetic freedom and structural evolution behavior, resulting in interlayer abnormal shrinkage, spontaneous bond collapse and lack of judgment basis for the coupling relationship between magnetism and interlayer structure. The technical scheme comprises the following steps: establishing a crystal structure model taking MA2Z4 material as a mother body; cutting and constructing an asymmetric Janus single layer; constructing a double-layer AA stacking initial model; performing geometric structure optimization and static self-consistent calculation under non-spin polarization and spin polarization conditions respectively; comparing the interlayer spacing, magnetic moment distribution and electronic state characteristics under the two conditions; analyzing the inhibitory effect of interface magnetism on interlayer bonding tendency by combining the electron localization function and the crystal orbital Hamiltonian population; and finally establishing the cooperative evolution relationship among magnetism, interlayer coupling and electronic structure, thereby providing a theoretical basis for identifying stable double-layer van der Waals configuration.

This invention discloses a SOT-MRAM device, belonging to the field of magnetic random access memory technology. The SOT-MRAM device includes, from bottom to top, a bottom electrode, a spin orbital layer, a magnetic tunnel junction, an antiferromagnetic coupling layer, and a top electrode. The current propagation direction in the spin orbital layer is the same as its own long axis direction. The magnetic moment of the magnetic tunnel junction is perpendicular to its own film surface direction. The magnetic tunnel junction includes a free layer with bulk vertical anisotropy. An inclined sidewall is formed on one side of the free layer using an etching process, creating a continuous thickness gradient along the short axis of the spin orbital layer. This invention introduces structural asymmetry through the thickness gradient of the free layer, breaking the symmetry and replacing the effect of the traditional external magnetic field to achieve zero-magnetic-field flipping.

The application provides an arbitrary dimension magnetic anomaly gradient positioning method for buried target detection, comprising the following steps: an optimization function modeling step: constructing an arbitrary dimension magnetic anomaly gradient function based on a magnetic dipole model; an optimization solving step: obtaining the position and magnetic moment module value of a target object through a particle swarm optimization algorithm based on the arbitrary dimension magnetic anomaly gradient function; and a data fusion step: fusing multiple sensor information based on the position and magnetic moment module value of the target object to obtain the buried depth of the target object under cross-medium conditions.

The application discloses a kind of ferrite gyromagnetic nonlinear loss transient response theoretical model and parameter simulation method under vertical pumping configuration, belong to microwave technical field, including the following steps: obtaining ferrite material parameters and target excitation microwave signal parameters, signal parameter at least includes microwave signal frequency, pulse width tau;Pulse width dependent function for representing consistent precession magnetic moment and the coupling strength of non-consistent precession magnetic moment (spin wave) is constructed.In view of this, the application first establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau) in the theoretical framework of vertical pumping configuration, establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau).The model can accurately describe the nonlinear effect of ferrite under nanosecond transient pulse excitation, and the dynamic law of the excitation condition and the change of pulse width.For the design of ferrite limiter device facing high-power microwave electromagnetic environment, important theory and design basis are provided.

The application discloses a spacecraft magnetic moment attitude control method based on a non-inverse iteration algorithm, and the method establishes a linear periodic model for a spacecraft attitude control system which only relies on a magnetic moment; on the basis, according to a linear quadratic optimal control theory, an optimal controller design problem is converted into a solution problem of a discrete periodic Riccati equation associated with the optimal controller design problem; on the basis of a gradient descent principle, an error function is constructed, and a non-inverse iteration algorithm based on the gradient descent principle is proposed to solve the discrete periodic Riccati equation, so that a matrix inversion operation in a traditional solution method is avoided, and the calculation efficiency and the numerical stability are effectively improved; the obtained Riccati equation solution is used to obtain an optimal state feedback control law, so that the spacecraft attitude optimal control only using the magnetic moment is realized, and a new solution scheme is provided for an attitude control problem of a limited actuator in a space task.

The application discloses a kind of full material state multi-field coupling magnetic phase change regulation and control method and application system, it is related to magnetic phase change technical field, it solves the technical problem that existing technology exists excitation source single and material state range narrow, including the following steps: step 1, based on the determination rule of excitation source, at least one of magnetic field, electric field, temperature field, stress field is selected to constitute the excitation source, and the interaction of the excitation source and the electron spin or magnetic moment of substance occurs and changes system free energy;Established the unified regulation and control method covering multiple excitation sources, multiple material states, solved the technical problems that existing technology excitation source is single, material state range is narrow;Provide specific material system and implementation mode, cover solid alloy, liquid magnetorheological fluid, soft matter hydrogel, high-entropy alloy and multiple material states;Application system integrates memory energy storage and trace displacement driving dual function, can be applied to new energy storage, micro-nano precision manufacturing, aerospace, biological medical treatment and other fields.

The application discloses a high-temperature superconducting diode with break-through liquid nitrogen temperature and controllable polarity and an implementation method thereof, and belongs to the technical field of semiconductor devices. The application can adapt to different circuit function requirements by presetting a built-in magnetic field to the magnetic substrate and locking the polarity of the high-temperature superconducting diode. The high-temperature superconducting diode is integrated with a single high-temperature superconducting material and a magnetic substrate, and a complex heterojunction is not needed, so that the preparation difficulty and cost are reduced, and large-scale integration is facilitated. The magnetic moment of the magnetic substrate is used as a built-in magnetic field source, so that the dependence on a continuous external magnetic field is completely eliminated, and the convenience and reliability of practical application are improved. A copper oxide high-temperature superconducting sheet is adopted, so that the liquid nitrogen temperature bottleneck is broken through, and the application potential in practical environments is expanded. The application solves the problems of low working temperature and dynamic polarity regulation of the superconducting diode, and has important significance for promoting the development of low-power-consumption electronic circuits and quantum computing as a basic operation element of low-power-consumption high-energy-efficiency circuits.

A magnetic ring and DC contactor, the inner ring side wall, outer ring side wall of magnetic ring are magnetic pole of opposite magnetic respectively, the annular surface connected between the inner ring side wall and the outer ring side wall are the first surface and the second surface of magnetic ring respectively, magnetic ring is uniformly separated into multiple magnetic domains along the circumferential direction, and the same magnetic domain corresponds to the mutual misregistration of two surface areas of the first surface and the second surface.The utility model discloses a magnetic ring, and the magnetic pole of magnetic ring can form 360 ° around magnetic loop on the inner ring side wall and the outer ring side wall respectively, can effectively avoid the problem that local magnetic field density is too high, makes magnetic force reach the best state under the same cost, when magnetic ring is applied to DC contactor, magnetic ring is assembled as an indivisible whole, avoids the assembling deviation caused by the same repulsion between multiple permanent magnets, simplifies the assembling process, simultaneously, the mutual misregistration of two surface areas of the first surface and the second surface corresponding to the same magnetic domain, is favorable for prolonging magnetic moment.

The present invention relates to probabilistically controllable random number generators. According to one embodiment, a random number generator includes a spin current generating layer formed of a spin Hall effect conductive material and a spintronic device disposed thereon. The spintronic device includes a free magnetic layer disposed on the spin current generating layer, a non-magnetic intermediate layer disposed on the free magnetic layer, and a reference magnetic layer disposed on the non-magnetic intermediate layer. The spin current generating layer is configured to receive a first in-plane current in a first direction to rotate a magnetic moment of the free magnetic layer from an easy axis direction to a hard axis direction, and upon cessation of the first in-plane current, the magnetic moment of the free magnetic layer is randomly rotated from the hard axis direction back to either a positive direction or a negative direction of the easy axis. A magnetic moment of the reference magnetic layer is fixed in either the positive direction or the negative direction of the easy axis. The spintronic device is configured to receive a perpendicular current to read a resistance state of the spintronic device.

The application relates to the technical field of simulation calculation and discloses a hysteresis loop simulation method based on mumax3, which comprises the following steps: obtaining the parameters of a magnetic material, and establishing a simulation model according to the parameters of the magnetic material; applying a field strength to the simulation model to obtain a fully saturated state of the magnetic material; applying a cosine-type field strength gradually decreasing with time in a peak value to the simulation model in the saturated state, and simultaneously performing LLG equation solving until the field strength peak value is reduced to below a preset threshold value, and taking the corresponding magnetic moment state as a zero field strength state; applying an alternating field strength to the simulation model in the zero field strength state, and simultaneously performing LLG equation solving calculation to complete loop simulation, so that a hysteresis loop is obtained. The magnetic material in the saturated state is demagnetized, the magnetic moment distribution of a demagnetized state under the zero field strength which is in line with the actual physical situation is obtained, and the state is taken as the basis of Mumax3 micromagnetic simulation calculation, so that a hysteresis loop with higher precision can be obtained.

The application provides a spacecraft pure magnetic control sun safety control method and system based on a magnetic moment device, which comprises the following steps: calculating a normal vector of a rotation shaft plane through a sun vector and a sun-pointing vector of the system, normalizing a magnetic field vector and constructing a unit orthogonal vector in the normal plane, solving an optimal rotation shaft vector in combination with a rotation inertia array, dynamically adjusting a control parameter according to a geometric included angle between the optimal rotation shaft and an inertial angular velocity of the system, superimposing a magnetic control sun pointing directional control amount and a damping control amount to obtain a total control amount. The system comprises vector calculation, optimal rotation shaft solving, control parameter adjustment and magnetic control amount output modules connected in sequence, and can be additionally provided with an execution driving module. The application fully considers the geometric relationship of multiple vectors, avoids attitude oscillation divergence, and can realize a sun pointing directional accuracy of ≤15° in less than one orbit period, thereby guaranteeing the charging of a solar cell array and providing a reliable pure magnetic control scheme for a spacecraft safety mode, and the engineering application value is remarkable.

This invention relates to a multi-level back electromotive force (EMF) suppression circuit for a large magnetic moment torque converter, comprising: an H-bridge drive circuit configured to drive a large magnetic moment torque converter load; an isolation diode, the anode of which is connected to a power supply terminal to which a supply voltage is applied, and the cathode of which is connected to the anode of the H-bridge drive circuit, forming a back EMF detection point; an energy discharge control circuit electrically connected to the detection point; a first-stage TVS suppression circuit, the cathode of which is connected to the power supply terminal, and the anode grounded; and a second-stage TVS suppression circuit connected to both ends of the large magnetic moment torque converter load. This invention, through the coordinated operation of multiple protection circuits, maximally suppresses and eliminates the back EMF generated from the load end.

This application relates to a Stern-Glach magnetic analysis method. The method includes: constructing a particle beam to be tested; the particle beam being atoms or molecules with bound electrons; generating a non-uniform magnetic field along the path of the particle beam, and synchronizing the arrival time of the particle beam to the non-uniform magnetic field with the generation time of the non-uniform magnetic field so that the particle beam is subjected to a pulse of the non-uniform magnetic field when passing through it; the pulse width of the non-uniform magnetic field is set based on the orbital period of the electrons in the particle beam; obtaining the landing position of the particle beam after passing through the non-uniform magnetic field; and obtaining statistical information on the instantaneous magnetic moment of the particle beam based on the landing position. This method can detect the instantaneous magnetic moment of a particle beam.

The application discloses a kind of permanent magnet magnetic field source devices of controllable magnetic moment, including base and rotating power device installed on base, it is characterized in that, rotating power device transmission connection is connected to the rotating seat installed on base, first permanent magnet and second permanent magnet are respectively installed on the two sides of rotating seat by transmission rotating shaft, rotating seat can be driven control first permanent magnet and second permanent magnet rotate around transmission rotating shaft under the operation of rotating power device, to change the included angle size between them;It is composed of a pair of semi-ring permanent magnet and peripheral mechanical rotating device, the size of permanent magnet magnetic circuit air gap can be adjusted using mechanical rotating device, so as to achieve the purpose that external magnetic moment size is adjusted by adjusting device.The permanent magnet magnetic field source device of controllable magnetic moment designed in the application combines the advantages of low energy consumption of permanent magnet magnetic field source and controllable magnetic moment of electromagnetic magnetic field source, and is suitable for use on energy-limited platform.

This invention discloses a multi-state magnetic random access memory (MRRAM), comprising a bottom electrode with a first current channel and a second current channel that are perpendicular to each other and electrically isolated; a cylindrical giant magnetoresistive / tunneling magnetoresistive structure disposed on the bottom electrode; a top electrode disposed on the giant magnetoresistive / tunneling magnetoresistive structure; and a spin generation layer disposed on a cross-shaped electrode, receiving current from the two channels to generate spin orbit moments. This invention, through dual-current synthesized spin orbit moment technology, achieves precise multi-angle control of the magnetic moment direction of the ferromagnetic layer while ensuring complete flipping of the antiferromagnetic layer (high stability); it resolves the contradiction between stability and multi-stateness, enabling the MRRAM to store multiple stable resistive states while maintaining high stability, significantly improving storage density.

The application provides a pinned ferromagnetic layer structure, a manufacturing method thereof and an electromagnetic device. The pinned ferromagnetic layer structure comprises a substrate, a ferromagnetic layer to be pinned, and an antiferromagnetic layer which is wrapped around the ferromagnetic layer to be pinned. The direction of the magnetic moment of the antiferromagnetic layer is parallel to the direction of the pinning magnetic field required by the ferromagnetic layer to be pinned. The pinning of the ferromagnetic layer to be pinned is achieved by forming the antiferromagnetic layer on the side of the ferromagnetic layer to be pinned and making the direction of the magnetic moment of the antiferromagnetic layer parallel to the direction of the pinning magnetic field required by the ferromagnetic layer to be pinned. Since the antiferromagnetic layer is located on the side of the ferromagnetic layer to be pinned, no antiferromagnetic layer is required above and below the ferromagnetic layer to be pinned. Therefore, other additional layers such as buffer layers can be arranged above and below the ferromagnetic layer to be pinned without being affected by the antiferromagnetic layer, so that the pinning effect of the antiferromagnetic layer is not weakened due to lattice mismatch and material mixing at the interface, and the pinning effect is improved.

This application provides a method, apparatus, medium, and system for magnetic target localization. The method includes: acquiring observed values ​​of the measurement area where the magnetic target to be located is located; establishing a target physical model based on a magnetic dipole model; inputting a set of hypothetical magnetic target position parameters and magnetic moment parameters into the target physical model to obtain theoretical predicted values, wherein the theoretical predicted values ​​include theoretical values ​​of the magnetic gradient tensor and the total magnetic field strength; constructing an objective function based on the difference between the theoretical predicted values ​​and the corresponding observed values; and adjusting the hypothetical magnetic target position parameters and magnetic moment parameters through an optimization algorithm to minimize the objective function and obtain the position coordinates of the magnetic target. Some embodiments of this application can accurately determine the position information of a magnetic target using only single-point (or finite-point) observation data, overcoming the technical bottleneck of existing single-point magnetic gradient tensor localization methods.

A system for determining a manipulation of a user-borne device by a user including a user-borne device including a body, at least one magnetic object defining a magnetic moment vector and operationally coupled to the body such that a rotation of the body about a first rotation axis causes a rotation of the at least one magnetic object about the first rotation axis, a plurality of magnetometers associated with an interaction surface, wherein the plurality of magnetometers is configured to create a sensing volume and configured to measure a magnetic field associated with the at least one magnetic object, wherein the system is configured to register a scroll event when a rotation of the body about the first rotation axis is determined by the system on the basis of the measured magnetic field associated with the at least one magnetic object.

The application discloses a kind of positioning of long-distance magnetic target and its design method, belong to the target positioning technical field based on magnetic field.It includes: S100, the position coordinates and magnetic moment of magnetic interference source are inverted using short baseline magnetic detection system, then real-time stripping interference magnetic field generated by magnetic interference source at long baseline magnetic detection system using inversion result, finally realize long-distance magnetic target positioning using long baseline magnetic detection system, obtain the magnetic moment vector m2 of magnetic target;S200, according to actual working condition and detection demand, the design method of each parameter of magnetic detection system is proposed in combination with the magnetic moment vector m2.The application uses short baseline magnetic detection system to real-time strip platform magnetic interference, and realizes long-distance magnetic target positioning using long baseline magnetic detection system.

This application provides a structural optimization method for a three-coil inductive abrasive particle detection sensor. Applied to the field of sensor technology, this method constructs a sensor structural parameter set based on the geometric and turn count parameters of the sensor coils, sensor installation constraints, and wire diameter specifications. It calculates the axial magnetic field distribution of the coil using the precise integral of the magnetic induction intensity along the central axis of the thick coil. It obtains the equivalent magnetic moment by combining a particle response model and calculates the induced voltage corresponding to each axial position based on reciprocity. It samples the induced voltage along the axial position to construct a position domain event waveform and extracts the main peak feature within a preset search interval. Based on the extracted main peak feature, it constructs a target evaluation index and performs multi-objective optimization to obtain a non-dominated candidate solution set. It then performs truth value verification and qualification screening on the candidate solution set to obtain the optimal structural parameter solution set, achieving efficient, stable, and interpretable optimization design of the three-coil sensor structure.

The present application discloses a method and system for measuring a magnetic moment parameter, a storage medium, and an electronic device. The method comprises: measuring, under a target gradient field, a resonant frequency and a resonance amplitude of a sample rod with a magnetic sample to be measured mounted thereon, wherein the target gradient field is generated by a magnetic field system; acquiring a mass of the magnetic sample to be measured, and determining, according to the mass, the resonant frequency, and the resonance amplitude, a magnetic force exerted on the magnetic sample to be measured within the target gradient field; and determining, according to the magnetic force exerted on the magnetic sample to be measured and a current parameter of a gradient coil within the magnetic field system, a magnetic moment parameter of the magnetic sample to be measured. The present application addresses the problems in the related art of high equipment costs and low measurement accuracy when performing magnetic measurements on magnetic samples to be measured.

This invention provides a circular magnetic pole orientation identifier with adjustable magnetic moment, belonging to the field of detection technology. It includes: a base with a cavity formed along its thickness direction, and a movable body rotatable along the cavity's axis embedded within the cavity. A first mounting portion for mounting a magnet to be tested is provided on the movable body. A base platform is provided on each side of the base, and a second mounting portion for mounting a known magnetic pole magnet is provided on each platform. The first mounting portion is sandwiched between the two second mounting portions. When the magnet to be tested and the known magnetic pole magnet are placed on the first and second mounting portions respectively, the ends of the two known magnetic pole magnets located on the two second mounting portions facing the first mounting portion are opposite magnetic poles. This invention, by providing two second mounting portions, enables simultaneous detection and identification of the pole positions of the two ends of the magnet to be tested, making operation convenient and accurate.

This invention relates to a satellite magnetic stability control method for on-orbit operating mode switching, belonging to the field of satellite magnetic stability control; it includes the following steps: Step 1, magnetic design of individual equipment; Step 2, measurement of magnetic moment change of individual equipment using the method of measuring the magnetic moment after demagnetization under zero magnetic field; Step 3, magnetic testing and magnetic compensation calibration of each individual equipment under each satellite operating mode; by reducing the magnetic moment change of individual equipment during satellite operating mode switching, the magnetic stability of the entire satellite is ensured during operating mode switching, so that the magnetic moment change of the entire satellite is minimized, thereby reducing the impact of satellite operating mode switching on in-situ magnetic field measurement tasks; this invention has the advantages of good control effect and high control accuracy for satellite magnetic control.

This invention relates to the field of aerospace technology, specifically to a high-performance tangential-field Hall thruster considering on-orbit magnetic moment compensation. The thruster includes: a ceramic discharge channel and a fixed structure, a magnetic moment compensation mechanism, an anode, a housing, and a base plate. The housing is mounted on the base plate, the ceramic discharge channel is located inside the housing, the fixed structure is fitted onto the ceramic discharge channel and mates with the inner wall of the housing, the anode is located within the ceramic discharge channel and extends out of the housing and base plate, and the magnetic moment compensation mechanism is fitted onto the fixed structure and located between the fixed structure and the base plate. By adding a magnetic moment compensation mechanism that can generate an opposite magnetic moment to the original tangential-field Hall thruster structure, the overall magnetic moment of the thruster is reduced. Based on the principle of magnetic moment vector cancellation, by adding a reverse-fitting magnetic moment compensation mechanism, the overall residual magnetic moment of the thruster is precisely reduced, meeting the magnetic moment requirements of on-orbit missions and eliminating the adverse effects of magnetic interference torque on spacecraft attitude and orbit control accuracy.

This invention discloses a joint inversion method for transient electromagnetic and magnetic data, comprising the following steps: acquiring transient electromagnetic observation data and magnetic observation data; converting the transient electromagnetic observation data into transient electromagnetic moment data; constructing a joint inversion objective function based on the transient electromagnetic moment data and magnetic observation data, the joint inversion objective function including: data fitting residual terms and model constraint terms; using a multivariate Gaussian mixture model to parameterize the model constraint terms, obtaining the coupled model constraint terms; combining the data fitting residual terms and the coupled model constraint terms into the final objective function, and minimizing the final objective function through an optimization algorithm to obtain the electrical and magnetic parameters of the subsurface medium. This invention achieves joint inversion of transient electromagnetic and magnetic data, solves the problem of low computational efficiency in three-dimensional inversion by introducing transient electromagnetic moments, and utilizes rock physics constraints to couple electrical and magnetic parameters, making the inversion results more accurate and structurally consistent.

A spin-orbit moment magnetic random access memory (MORAM) and method for controlling an artificial antiferromagnetic free layer with ferroelectric metal are disclosed. The MORAM comprises multiple memory cells, with the free magnetic layer being an artificial antiferromagnetic structure comprising a first magnetic layer, a non-magnetically coupled layer formed on the first magnetic layer, and a second magnetic layer formed on the non-magnetically coupled layer. The ferroelectric metal layer simultaneously possesses ferroelectric polarization characteristics and a spin-orbit coupling effect, generating a spin-orbit moment when an in-plane current is applied to drive the magnetic moment reversal of the free magnetic layer. Simultaneously, the magnetic coupling state of the artificial antiferromagnetic structure is controlled by the ferroelectric polarization electric field. The simultaneous presence of ferroelectric polarization and spin-orbit coupling characteristics in the ferroelectric metal layer enables both ferroelectric control and spin-orbit moment writing functions, thereby simplifying the device structure, reducing the write current density required for magnetic moment reversal, and lowering device power consumption.

This invention provides a rapid and uniform magnetic powder filling device, relating to the field of magnetic powder molding and pressing technology. It includes: a fixedly positioned magnetic powder filling cylinder; a rotating sleeve with multiple radially extending magnet mounting slots along its circumferential wall; multiple sets of permanent magnets, each housed in a corresponding magnet mounting slot, capable of reciprocating along the radial direction of the magnetic powder filling cylinder; a changing alternating magnetic field is generated inside the magnetic powder filling cylinder to disperse magnetic agglomerates of the magnetic powder; promoting powder leveling and densification; this invention eliminates the magnetic agglomeration phenomenon between magnetic powders by preventing the magnetic moments of particles in the particle clusters formed by magnetic agglomeration from maintaining a state of unidirectional attraction; the vibration generated by the radial extension and contraction motion further improves the uniform filling effect of the magnetic powder by compacting and spreading the powder after the magnetic agglomeration has disappeared.

This invention provides a time-resolved ferromagnetic resonance measurement system, comprising a laser (for simultaneously outputting pulsed laser light and a synchrotron microwave synchronized with the pulsed laser), an optical path system, a sample module, a magnetic field module, a microwave modulation module, a photodetector, a signal extraction module, and a control unit. A delay module is configured to achieve controllable adjustment of the relative phase between the synchrotron microwave and the femtosecond probe light. The microwave modulation module modulates the synchrotron microwave and applies it to the sample. The photodetector converts the transmitted light signal into an electrical signal. The signal extraction module extracts the signal intensity and the relative phase between the modulated microwave and the pulsed laser. The control unit inverts the ferromagnetic resonance measurement parameters based on the above information. By sharing an optical clock with the same laser and combining delayed phase scanning, this system can reconstruct the time-domain magnetic moment response on the picosecond to nanosecond scale, directly obtaining the amplitude and phase of the magnetic moment in the transmission direction.