671 results about "Ferroics" patented technology

The invention provides a PT ferromagnetic resonance overvoltage suppression system and method based on graded damping. The system comprises a secondary resonance elimination module, the secondary resonance elimination module comprises a three-stage damping branch circuit which is connected in series with an open triangle of a voltage transformer, the three-stage damping branch circuit comprises a first current-sensitive resonance eliminator, a second current-sensitive resonance eliminator and a fixed resistor which are connected in parallel, and a branch circuit of the first current-sensitive resonance eliminator is connected in series with a first switch; a branch of the second flow-sensitive resonance eliminator is connected in series with a second switch, and a branch of the fixed resistor is connected in series with a third switch; the fan is used for carrying out air cooling on the first flow-sensitive resonance eliminator, the second flow-sensitive resonance eliminator and the fixed resistor; and the control module is used for controlling on or off of the first switch, the second switch and the third switch. Resonance early recognition is achieved through transient energy comprehensive criteria, three-level damping dynamic switching and fan intelligent temperature control are combined, and the three core problems of response lag, insufficient heat dissipation and weak self-adaption in ferromagnetic resonance suppression are solved.

The invention belongs to the technical field of magnetic suspension motors, and discloses magnetic suspension fan motor winding temperature monitoring equipment and an early warning method. The method comprises the following steps: laminating a preset temperature-sensitive ferromagnetic material and a magnetic suspension fan motor stator iron core according to a preset process to obtain a composite iron core; deploying a high-frequency excitation system on the composite iron core, adjusting the number of turns of a micro-coil of the high-frequency excitation system according to the target magnetic field intensity, collecting real-time excitation current, and analyzing to obtain magnetic induction intensity; analyzing the magnetic induction intensity through multi-physics field coupling iteration to obtain a winding three-dimensional temperature field; performing temperature gradient analysis on the three-dimensional temperature field, performing temperature early warning according to an analysis result, and dynamically adjusting motor operation parameters; according to the invention, the comprehensiveness of temperature monitoring of the magnetic suspension fan motor winding, the timeliness of early warning and the accuracy of cooling control are effectively improved, and safe and stable operation of the motor under complex working conditions is guaranteed.

The invention discloses a resonance elimination circuit, method and device, and relates to the technical field of circuits, and the circuit comprises a controller, a resonance elimination resistor and a switching circuit. Two ends of the resonance elimination resistor are respectively connected with the neutral point of the voltage transformer and the ground. The controller controls the switching circuit to be switched off when ferromagnetic resonance is detected, so that the resonance elimination resistor is connected to suppress resonance; after the fault disappears, the control switch is switched on, and the neutral point is directly grounded. The controller compares the neutral point current with a first threshold value to determine resonance generation, and determines fault disappearance when the current is smaller than a second threshold value. And when the resonance elimination resistor is a variable resistor, the controller adjusts the resistance value according to the current change rate and a pre-learned mapping relation. The switching circuit can adopt a switching tube or a relay, and the controller realizes switching by controlling the switching tube to be turned off or a relay coil to be powered off. The circuit can rapidly suppress ferromagnetic resonance, guarantee system stability and improve fault processing efficiency.

The invention discloses a method and a device for detecting and positioning an underground pipeline containing a ferromagnetic material. According to the invention, the fluxgate sensors and the position and attitude sensors are installed on the support frame, and the support frame is driven to rotate, so that rapid magnetic scanning measurement of the underground pipeline is realized, and the trend, the horizontal position and the depth of the pipeline are estimated. According to the invention, the efficiency is greatly improved by adopting a rotary scanning strategy, the problem of uneven or muddy ground is avoided, and the method is suitable for detecting a ferromagnetic target with a slender structure; the direction and depth of the pipeline are estimated by using the coordinates of the extreme points of the magnetic field, and the positions of ferromagnetic targets which are non-uniformly distributed along any straight line can be estimated; the method does not need an accurate magnetic field value, is suitable for a complex environment with strong interference, is short in estimation time, and supports real-time positioning of the pipeline; and the corresponding pipeline depth below each measurement node is estimated by using the measurement data of the plurality of measurement nodes at different heights, so that the method can be applied even if the pipeline is not horizontally buried.

The invention discloses a PT ferromagnetic resonance adaptive collaborative suppression method and system, and the method comprises the steps: sampling a voltage signal, a current signal and a PT secondary side voltage signal monitored by a high-voltage end sensing unit in real time, and calculating a primary side voltage change rate and harmonic content; comparing the calculated primary side voltage change rate and harmonic content with corresponding preset thresholds, controlling to input a neutral point reconstruction unit, and destroying resonance conditions by changing neutral point grounding impedance; after the neutral point reconstruction unit works, the input energy feedback unit is controlled and used for absorbing resonance energy; and when it is detected that the resonance threat is eliminated, the neutral point reconstruction unit and the energy feedback unit are controlled to be turned off in sequence, and active cooling of the high-voltage end sensing unit is started by using residual energy in the energy feedback unit. According to the method, by monitoring the voltage change rate and the harmonic content in real time, a neutral point is rapidly triggered to reconstruct and damage resonance, energy is absorbed and fed back through an energy feedback unit, and finally system safety recovery is achieved.

The invention provides a low-power-consumption write-in high-thermal-stability-factor memory device and a preparation method thereof. The device comprises a substrate, a spin / orbital flow generation layer, a ferromagnetic function layer, a SiO2 layer, an electrode plate and a regulation and control layer which are sequentially arranged from bottom to top, the spin / orbital flow generation layer is made of a two-dimensional transition metal chalcogenide material TaIrTe4, the ferromagnetic functional layer is made of a two-dimensional ferromagnetic material Fe < 3 + x > GaTe2, x is equal to 0-2, and the regulation and control layer is made of a two-dimensional ferroelectric material CuVP2S6; electric fields are applied to left and right ends of the regulation layer. The vertical magnetocrystalline anisotropy of the ferromagnetic functional layer is changed by regulating and controlling the ferroelectric material CuVP2S6 through an external electric field, and the high-current writing process of the device is reduced, so that the effects of reducing the power consumption and improving the thermal stability are achieved, and the durability of the device is improved.

The invention relates to the technical field of permanent magnet motor rotor structure optimization, and particularly discloses a permanent magnet motor rotor structure topological optimization method considering the nonlinear saturation characteristic of a ferromagnetic material, and the method comprises the steps: S101, carrying out the initial parameterization and meshing optimization of a design region variable; s102, determining the performance of the actual operation condition point of the permanent magnet motor load; s103, carrying out finite element analysis on an electromagnetic field and a mechanical field of the permanent magnet motor; and S104, carrying out iterative analysis on the magnetic conductivity of the nonlinear saturated ferromagnetic material, judging whether a result is converged or not, if the result is converged, entering the step S105, otherwise, returning to the step S103, and the like. The weight of the rotor of the permanent magnet motor is effectively reduced through a lightweight design result, the lightweight design of the rotor of the permanent magnet motor is realized while the mechanical and electromagnetic properties are ensured, and a design reference for actual production and manufacturing is provided for the weight reduction design of a rotor region of a permanent magnet region.

The invention provides a risk prediction and cooperative defense system and method for ferromagnetic resonance of a power grid. The data acquisition module is used for acquiring electrical quantity data and switch state data of a plurality of nodes of the whole network in real time; the data analysis module is used for analyzing the electrical quantity data through a preset first prediction model to calculate a first risk characteristic value, and analyzing the switch state data through a preset second prediction model to calculate a second risk characteristic value; the feature fusion module is used for calculating the risk probability and grade of the magnetic resonance of the starting iron by fusing the first risk feature value and the second risk feature value; and the early warning and execution module is used for generating early warning information and a self-adaptive regulation and control strategy according to the calculated risk probability and grade of the ferromagnetic resonance, and sending out a corresponding alarm according to the generated early warning information and the self-adaptive regulation and control strategy. Through multi-source data fusion analysis, advanced prediction of the ferromagnetic resonance risk is realized, and passive response is changed into active defense.

A superconducting computing apparatus includes: frequency tunable devices connected to each other and arranged in a shape; a ferromagnetic film disposed adjacent to the frequency tunable devices and having an up magnetic domain or a down magnetic domain; and a control circuit configured to adjust a position of a magnetic domain wall in the ferromagnetic film by applying a current to the ferromagnetic film, wherein the position of the magnetic domain wall controls a resonant frequency of the frequency tunable devices.

The invention relates to the technical field of electromagnetic measurement and state monitoring, and discloses a global state sensing system and method for an electromagnetic voltage transformer. The technical problems that in the prior art, data robustness is insufficient and actual working condition changes of a power grid are difficult to adapt due to the fact that accurate resonance circuit parameters are depended and a single calculation path is adopted are solved. According to the method, ferromagnetic resonance phenomena under various faults are simulated based on electromagnetic transient simulation, phenomenon data are obtained, and influence factors are analyzed to obtain influence rule data. And taking the rule data as input, and adopting a comprehensive solving method combining programming calculation, system structure chart calculation and electromagnetic transient software simulation to obtain a high-reliability state quantity time sequence. Based on the time sequence, a nonlinear model which takes loss into account and does not depend on precise resonant circuit parameters is derived, and explicit mathematical functions of primary current and transient overvoltage of the voltage transformer are obtained.

An apparatus and a polishing system for rotational magnetorheological abrasive flow nano-finishing are described. The apparatus includes an upper cylinder with coupled upper piston and a lower cylinder with coupled lower piston. A first motor drives synchronized reciprocating motion of both pistons via respective slider crank mechanisms. A magnet fixture positioned between the cylinders includes permanent magnets arranged in a ring configuration with a central hole for workpiece placement. A second motor rotates the magnet fixture to manipulate magnetic field orientation. The cylinders, pistons and magnet fixture define a space for containing magnetorheological (MR) fluid including ferromagnetic particles, abrasive particles and carrier fluid. The configuration enables controlled fluid flow through the hole while maintaining direct workpiece contact, with ferromagnetic particles exhibiting both rotational and reciprocal movement patterns. This dual-motion finishing approach enables material removal through magnetic field-controlled abrasive action, achieving nano-scale surface quality on complex geometries.

The invention provides an annular segmented iron yoke center magnetic field uniformity optimization method and device, relates to the technical field of superconducting electrical iron yokes, and solves the technical problem that the uniformity of a superconducting magnet center magnetic field is difficult to improve in the prior art. The method specifically comprises the following steps: acquiring physical basic parameters of the superconducting magnet; establishing a two-dimensional axisymmetric calculation model, determining radial and axial calculation ranges, and generating a two-dimensional grid coordinate matrix; calculating an initial static magnetic field by using the two-dimensional grid coordinate matrix based on the Biot-Savart law and the axial symmetry characteristic; constructing an annular yoke multi-parameter optimization problem, and performing global parameter search by adopting a genetic algorithm to obtain yoke optimization parameters; based on the magnetic dipole theory and the saturation characteristic of the ferromagnetic material, a correction model of the yoke to the magnetic field is established by combining yoke optimization parameters, an additional magnetic field generated by the yoke is calculated, the additional magnetic field and the initial static magnetic field are superposed, and the total magnetic field intensity is obtained. The method is used for optimizing the uniformity of the iron yoke center magnetic field.

An acoustic baffle comprising: an acoustic panel comprising two opposed major faces and a plurality of minor faces that extend between the two major faces, wherein the acoustic panel is a man-made vitreous fibre (MMVF) panel; a spacer element fixed to a first minor face of the acoustic panel, wherein the spacer element comprises a ferromagnetic material; and at least one magnet fixed to a second minor face of the acoustic panel.

The invention discloses a T ferromagnetic annealing performance consistency optimization method based on reinforcement learning, and the method comprises the steps: collecting the annealing temperature, heat preservation time, magnetic field intensity, cooling rate and other key process parameters in real time through an industrial Internet of Things, and improving the data quality through normalization and multi-stage data cleaning processing; intelligent evaluation and label classification of the process state are realized by using a multi-layer neural network; a dynamic reward function weight is introduced in combination with a process state label, and a deep Q network reinforcement learning model is driven to perform strategy optimization; the method supports self-adaptive model updating of periodic data acquisition and strategy rapid switching under significant change of a process state, realizes intelligent cooperative closed-loop control of multiple parameters in the annealing process, and improves the operation stability of the annealing process and the consistency of material performance.

The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A rate of change in an area ratio of a protrusion having a height of 5 nm or more and 10 nm or less, which is obtained by measuring a measurement region of 5 μm×5 μm on a surface of the magnetic layer before and after 1000 reciprocating slides with respect to an LTO 8 head at a head tilt angle of 15° in an environment of a temperature of 35° C. and a relative humidity of 80%, with an atomic force microscope, is 10.0% or less.

A vehicle for driving on ferromagnetic structures includes a chassis, first and second wheels rotatably coupled to the chassis, and a magnet array coupled to the chassis for magnetically attracting the vehicle to the structures. The magnet array is controllable to aim a magnetic field produced by the magnet array over a range of angles relative to the chassis.

Various embodiments of a multifunctional ferromagnetic fiber robot (MFFR) are described. According to one embodiment, the MFFR includes a central core and a ferromagnetic layer around the central core. The central core can include a waveguide, an electrode, and a hollow channel in one example. The ferromagnetic layer can include magnetic microparticles distributed in a thermoplastic elastomer. The waveguide can include silica or polymer waveguides. The electrode can include high-melting-point or low-melting-point metal electrodes. The MFFR includes or exhibits magnetic actuation properties that are activated in response to an external magnetic field. The magnetic actuation properties are adjustable based on a cross-sectional geometry of the central core and a particle loading concentration of the magnetic microparticles.

A quantum frequency converter includes a laminate including at least one topological insulator film and at least one ferromagnetic film that are laminated together. The laminate includes an interface between the topological insulator film and the ferromagnetic film and configured to be irradiated with laser light. The quantum frequency converter includes a magnetic field applying unit configured to apply a magnetic field with a component perpendicular to the interface to the laminate, and a microwave transceiver configured to transmit and receive a microwave to and from the laminate.

An electromagnetic actuator assembly, integrated within a boring tool, for controlling unwanted machining vibration, comprising an outer tubular oscillating mass made of ferromagnetic material, through which the magnetic flux can pass; an inner stator that comprises an electromagnet assembly, located at the center of the tubular oscillating mass, for applying a controllable magnetic field to the oscillating mass; one or more damping elements, each having one or more springs and / or a damping material with predetermined stiffness and damping properties (such as a polymer or oil); a controller for providing a desired current to the electromagnets of the electromagnet assembly to obtain the controllable magnetic field; a holder for allowing the rotation of the electromagnet assembly to a desired angle, for stimulating the oscillating mass to apply a damping force, based on a combination of the magnetic field and stiffness and damping properties, which is aligned with the direction of the unwanted vibration.

The invention discloses an in-vivo ferrofluid drug transport performance testing device and a testing method. The device comprises a mounting table, a ferrofluid loading device and a ferrofluid loading device, the test board is mounted on the mounting table, a test substrate is arranged on the test board, the test substrate is used for placing ferrofluid droplets, and the ferrofluid droplets are wrapped with fluorescent particles; the moving module is mounted on the mounting table, the moving module is provided with a supporting column capable of moving front and back, the supporting column is provided with a movable table capable of moving up and down, and a magnetic block is arranged on the movable table and located below the test table; a shooting area of the camera faces the test substrate; and a light-emitting area of the excitation light source faces the test substrate. Compared with the prior art, the technology has the advantages that quantitative determination of the Roussonii instability critical magnetic field is realized, a reliable basis is provided for optimizing magnetic field parameters, and the leakage rate of the nano-drug in the targeted transportation process is accurately quantified by shooting and analyzing the residual path of the fluorescent particles during targeted transportation of the ferrofluid droplets; the method has the advantages of high repeatability, reliable detection and the like.

The application discloses a magnetoelectric heterojunction film and a preparation method thereof. The magnetoelectric heterojunction film comprises a strontium titanate base layer, a strontium ruthenate electrode layer, a bismuth ferrite ferroelectric material layer and a SmCo-based ferromagnetic material layer which are stacked in sequence. The magnetoelectric heterojunction film has the multi-ferroelectric layer room-temperature magnetoelectric coupling effect and the excellent magnetic performance of the ferromagnetic layer, and the magnetoelectric coupling effect of the heterojunction film can be enhanced through the strong exchange bias effect at the interface.

The utility model provides drilling fluid ferromagnetic substance removing equipment, and relates to the technical field of drilling auxiliary equipment, the drilling fluid ferromagnetic substance removing equipment comprises a material screening module, a machine body frame, a liquid draining module, a magnetic suction module, a cleaning module and a PLC, the material screening module is fixed above the machine body frame in a bolted mode, the liquid draining module is fixedly connected below the material screening module, and the magnetic suction module is fixedly connected below the cleaning module. A magnetic attraction module is arranged below the liquid draining module, the magnetic attraction module is fixed to the inner side of the machine body frame in a bolting mode, a cleaning module is arranged below the magnetic attraction module, the cleaning module is fixed to the machine body frame in a bolting mode, and the PLC is electrically connected with the material screening module and the magnetic attraction module. Drilling fluid can be evenly distributed on the sheet base band through the liquid draining plate, the adsorption time is prolonged, the adsorption capacity of the powerful magnet is improved, the device has a stronger magnetic adsorption effect, ferromagnetic substances in the drilling fluid can be efficiently removed through the device, through multi-layer adsorption filtration, the removal effect is good, and the efficiency is high.

A magnetic medium is described which includes a thin film magnet structure formed of a ferromagnetic alloy or compound. The thin film magnet structure includes one or more ferromagnetic domains and is coupled to one or more optical structures. Each of the one or more ferromagnetic domains have a magnetization that is switchable between two or more states. Each of the one or more optical structures is configured to increase absorbance of light at a target wavelength in the thin film magnet structure, such that in response to illumination of a ferromagnetic domain with continuous-wave light including the target wavelength, that ferromagnetic domain undergoes all-optical magnetic switching.

Provided is a magnetic storage element comprising a first stack composed of: a storage layer formed from a ferromagnetic body; a first fixed layer formed from a ferromagnetic body; a first spacer layer that is sandwiched by the storage layer and the first fixed layer, and that causes antiferromagnetic exchange coupling between the storage layer and the first fixed layer; and a tunnel barrier layer that is provided to the opposite-side surface of the storage layer from the first spacer layer and that is formed of a non-magnetic body. The first stack is sandwiched by a first electrode and a second electrode.

The invention relates to a method for the formation of skyrmions or Néel-type spin textures in a ferromagnetic material, preferably in a ferromagnetic alloy, comprising the steps of (i) providing an underlayer material, (ii) depositing a film of a ferromagnetic material thereon in a manner that (iii) the film obtained shows a vertical strain gradient (I), where ε t is the strain along the normal to the plane of the deposited film, and further to the materials so prepared and to their use in spintronics technology.

This spin current magnetization rotational type magnetoresistive element includes a magnetoresistive effect element having a first ferromagnetic metal layer having a fixed magnetization orientation, a second ferromagnetic metal layer having a variable magnetization orientation, and a non-magnetic layer sandwiched between the first ferromagnetic metal layer and the second ferromagnetic metal layer, and spin-orbit torque wiring which extends in a direction that intersects the stacking direction of the magnetoresistive effect element, and is connected to the second ferromagnetic metal layer, wherein the electric current that flows through the magnetoresistive effect element and the electric current that flows through the spin-orbit torque wiring merge or are distributed in the portion where the magnetoresistive effect element and the spin-orbit torque wiring are connected.

The application discloses a kind of based on the solution method and system of ferromagnetic quantum many-body model of fractional matching, based on the solution method of ferromagnetic quantum many-body model of fractional matching includes: obtaining and according to the Hamiltonian of ferromagnetic quantum many-body model, the corresponding undirected graph is generated;For all edges in undirected graph, angle parameter is introduced, and first parametric formula is obtained;According to first parametric formula and Hamiltonian, the second parametric formula of system energy is obtained;According to undirected graph, and by quasi-uniform fractional matching strategy, determine fractional matching scheme;According to the second parametric formula and fractional matching scheme, the entanglement degree control parameter that makes system energy maximum or minimum is output;According to entanglement degree control parameter, first parametric formula and second parametric formula, the approximate ground state and approximate energy of model are obtained.The application is distributed to a certain proportion of entanglement by quasi-uniform fractional matching strategy, so that each pair of adjacent particles is distributed, so that higher approximation ratio is realized.

The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with water, which is measured on a surface of the magnetic layer, is 95° or more and 105° or less, and standard deviation σ of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.

The invention relates to the technical field of advanced materials, integrated circuits and microelectronic devices, and provides an atomic layer Van der Waals heterojunction-based sensing, storage and calculation integrated device and a preparation method thereof. The device comprises a substrate, a first gate electrode, a first two-dimensional Van der Waals alternating magnetic material layer, a second gate electrode, a first two-dimensional Van der Waals ferromagnetic material layer, a two-dimensional Van der Waals insulating material layer, a second two-dimensional Van der Waals ferromagnetic material layer, a third gate electrode and a second two-dimensional Van der Waals alternating magnetic material layer which are sequentially stacked from bottom to top, and a fourth gate electrode and an encapsulation layer. According to the invention, the integration of the sensing of optical signals, the nonvolatile storage of information and the logic calculation function is realized in a single device unit, and the sensing, storage and calculation integrated function of a single device constructed by an atomic layer is realized. On the basis, by combining and interconnecting a plurality of device units, basic logic functions such as an AND gate, an OR gate and a NOT gate can be further realized, and a solid foundation is laid for expanding application scenarios.

A magnetoresistive stack may include a first electrically conductive material, a fixed region having a fixed magnetic state, a free region configured to have a first magnetic state and a second magnetic state, a dielectric layer disposed between the fixed region and the free region, a spacer region, and a cap layer disposed between the spacer region and the free region. The free region may include a layer of ferromagnetic material, an insertion layer, an iPMA layer, and / or a low saturation magnetization layer.