1734 results about "Ferroics" patented technology

The invention discloses an intelligent operation and maintenance system and method for a high-voltage switch cabinet based on digital twinning, relates to the technical field of intelligent power grids, and solves the problems of nonlinear effect modeling distortion, cross-spatio-temporal scale coupling deviation accumulation, time sequence real-time contradiction and insufficient extreme working condition adaptation in the prior art. Hysteresis parameters of the ferromagnetic material are dynamically calibrated through a quantum annealing optimization algorithm, and electromagnetic-thermal field strong coupling synchronous calculation is realized by combining multi-scale mesh generation and an implicit thermal field iterative algorithm; constructing an incremental transfer learning framework to fuse aging features and real-time data, and correcting boundary conditions of the model by adopting four-dimensional variational assimilation; establishing a hybrid verification platform to dynamically feed back extreme working condition parameters, and generating a credible operation and maintenance instruction in combination with a block chain; according to the method, the contact temperature rise prediction precision, the residual life evaluation reliability and the circuit breaker transient response real-time performance are remarkably improved, and active immune type intelligent operation and maintenance of the high-voltage switch cabinet under the extreme working condition are achieved.

The invention provides a resonance elimination device and method for suppressing ferromagnetic resonance in a power system, and relates to the technical field of power system safety prevention and control. The resonance elimination device for suppressing the ferromagnetic resonance in the power system comprises a resonance elimination module used for consuming energy generated by the ferromagnetic resonance; an acquisition module; the detection module is used for detecting excitation inrush current between the neutral point of the voltage transformer and the high-voltage damping resistor in real time; the calculation module is used for calculating the rising edge slope of the magnetizing inrush current and calculating the offset voltage of the neutral point to the ground; the judgment module is used for continuously judging the relationship between the rising edge slope of the excitation inrush current detected in real time and each threshold value and the relationship between the numerical value of the neutral point to ground offset voltage detected in real time and each threshold value, and judging whether the system has a single-phase ground fault or not; and the control module controls the input of the harmonic elimination module. The resonance elimination device can accurately and quickly eliminate ferromagnetic resonance and effectively improve the resonance elimination efficiency of the ferromagnetic resonance.

The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cross-sectional area is 0.1% with a measurement region area as 100%, is 5 nm or more and 10 nm or less, and standard deviation σ of the VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.

A portable information handling system housing biases to the closed position by attracting a piece of ferromagnetic material disposed in a lid housing portion to a magnet in a speaker disposed in a main housing portion. A Hall sensor proximate the ferromagnetic material detects the speaker magnet in the closed position and communicates open or closed position detection through a flexible cable and hinge to an embedded controller in the main housing for execution of logic associated with open and closed positions, such as ACPI sleep and wake states.

The invention provides a hysteresis loop prediction model establishment method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out a hysteresis characteristic experiment on a ferromagnetic material, setting hysteresis loop related characteristics comprising magnetic induction intensity waveform data and magnetic field waveform data under the excitation of preset sine waves under different magnetic induction intensity peak values, establishing a hysteresis loop prediction model comprising an improved convolutional neural network model and a K-nearest neighbor algorithm model, training the improved convolutional neural network model, inputting a magnetic induction intensity peak value and magnetic induction intensity waveform data, and outputting magnetic field waveform data; and adjusting the magnetic field waveform data based on the feature data by using a K-nearest neighbor algorithm model to obtain a final magnetic field waveform result. According to the method, the hysteresis loop prediction model is established based on the improved convolutional neural network in combination with the K nearest neighbor algorithm, the overfitting phenomenon can be prevented, the training speed is higher, the resource consumption is lower, and rapid iteration and adjustment in practical application are facilitated.

A portable information handling system housing biases to the closed position by attracting a piece of ferromagnetic material disposed in a lid housing portion to a magnet in a speaker disposed in a main housing portion. A Hall sensor proximate the ferromagnetic material detects the speaker magnet in the closed position and communicates open or closed position detection through a flexible cable and hinge to an embedded controller in the main housing for execution of logic associated with open and closed positions, such as ACPI sleep and wake states.

The invention discloses a ternary magnetic selenide and a preparation method of a single crystal of the ternary magnetic selenide, and relates to the technical field of crystal material preparation. The chemical formula of the ternary magnetic selenide is VCrSe3, and the ternary magnetic selenide can be prepared by taking a vanadium source, a chromium source and a selenium source in a specific proportion as raw materials and an iodine source as a transport agent through a chemical vapor transport method. The crystal structure of the VCrSe3 single crystal is a monoclinic phase (I2 / m), and phase transformation from antiferromagnetic to ferromagnetic and spin reorientation occur at low temperature, so that the VCrSe3 single crystal has application potential in the fields of spintronics, optoelectronics and the like; the large-size and high-quality VCrSe3 single crystal prepared by the method can provide a material for intrinsic physical property research and development of functional devices such as optoelectronic devices and spinning electrons.

The present disclosure provides an orbitronic device having orbital Hall effect or inverse orbital Hall effect, and method for enhancing the efficiency thereof. The orbital torque device comprises: a ferromagnetic / non-magnetic heterojunction formed by compounding a ferromagnetic layer and a non-magnetic layer as an orbital current source, wherein the ferromagnetic layer contains a ferromagnetic material, the non-magnetic layer contains a non-magnetic material with weak spin-orbit coupling, the non-magnetic layer is used as an orbital Hall channel to generate orbital current, and the orbital current enters the ferromagnetic layer, so that an orbital torque is generated through an orbital-spin conversion effect of the ferromagnetic layer to realize switching of a magnetic moment. The present disclosure can provide orbitronic device with low cost and good performance.

The invention provides a track electronic device based on a track Hall effect and a magnetic memory device. The track electronic device comprises a substrate; the ferromagnetic / non-magnetic heterojunction structure is prepared on the substrate, the ferromagnetic / non-magnetic heterojunction structure comprises a ferromagnetic layer structure and a non-ferromagnetic layer structure serving as a track source, the ferromagnetic layer structure is located on the face, away from the substrate, of the non-ferromagnetic layer structure, and the ferromagnetic layer structure has perpendicular magnetic anisotropy; wherein the non-ferromagnetic layer structure is made of a 3d-5d metal material and a two-dimensional TMD material, and the ferromagnetic layer structure is an artificially synthesized antiferromagnetic layer or an artificially synthesized ferromagnetic layer. According to the orbital electronics device and the magnetic storage device which are formed on the basis of an artificially synthesized antiferromagnetic layer or an artificially synthesized ferromagnetic layer as a ferromagnetic layer, the orbital torque efficiency can be enhanced, the critical overturning current density is reduced, and the overturning speed is increased.

There is provided an implantable marker for use in surgical guidance. The implantable marker comprises one or more ferromagnetic elements formed of at least one ferromagnetic material and at least one diamagnetic element formed of at least one diamagnetic material. The at least one diamagnetic material comprises graphite having a substantially isotropic grain structure and the one or more ferromagnetic elements are juxtaposed the at least one diamagnetic element.

The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. The ferromagnetic powder is a hexagonal ferrite powder, tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.

The invention belongs to the technical field of magnetic functional materials, and particularly relates to a nanocrystalline magnetically soft alloy and a preparation method and application thereof. The invention provides a nanocrystalline soft magnetic alloy which comprises the following chemical components: Fe, Si, B, Nb, Cu, P and rare earth metal, and the rare earth metal is selected from at least one of Nd and Sm. According to the nanocrystalline magnetically soft alloy, a proper amount of rare earth metal is added, the ferromagnetic coupling exchange effect between ordered phases of the nanocrystalline magnetically soft alloy is improved, so that the magnetic induction intensity and the high-frequency magnetic conductivity of the nanocrystalline magnetically soft alloy are both improved, the magnetic conductivity of the nanocrystalline magnetically soft alloy at 100 kHz can reach 42000 or above, and the high-frequency magnetic conductivity of the nanocrystalline magnetically soft alloy at 100 kHz can reach 42000 or above. Meanwhile, the saturation flux density reaches up to 1.75 T or above, and the coercive force is as low as 0.8 A / m.

The invention relates to the technical field of power distribution network fault detection, in particular to an electromagnetic voltage transformer ferromagnetic resonance fault identification method, system and device and a storage medium. The identification method comprises the following steps: collecting, preprocessing and analyzing a zero-sequence voltage signal of a primary side of a power distribution network system; feature indexes of the low-frequency IMF component in the time domain and the frequency domain are solved and subjected to dimensionality reduction reconstruction, and the most appropriate dimensionality is determined to form a fault recognition feature vector matrix; and establishing a sample set, training a sample subset, building, training and configuring an RF model to construct a fault recognition model, and performing fault recognition on the sample set to judge the fault type of the sample. The improved CEEMD time-frequency signal decomposition method based on the T test and the variance contribution rate is provided for overcoming the defects that the number of IMF components obtained through CEEMD decomposition and the frequency band of the IMF components are not fixed, and a few pseudo-modal IMF components appear in a decomposition result, and KPCA is introduced for feature dimension reduction to solve the problem that redundant information exists due to excessive feature quantities.

An implantable marker for imaging and surgical guidance by susceptometry comprising one or more pieces of a ferromagnetic material having a total length to diameter ratio of at least about 500, and a total volume of less than about 1×10−11 m3. The one or more pieces of ferromagnetic material may have a high initial relative permeability (μr,i)>about 1000. Also disclosed is a detection system for locating an implantable marker comprising such an implantable marker; at least one drive coil arranged to excite the marker with an alternating magnetic field, and at least one sense coil arranged to detect a signal received from the excited marker; a magnetic field generator arranged to drive an alternating magnetic field through the at least drive coil; and at least one detector arranged to receive the signal from the sense coil and detect one or more harmonics of the drive frequency in the received signal.

A container magnetic mount for a device has a container lid defined by a rim cylindrical wall, a top, and a lid joint element. A lever arm has an arm joint element in rotating engagement with the container lid. The lid joint element and the lever arm joint element define a dynamic coupling with the lever arm being orientable between one or more arbitrary raised positions and a lowered position. The container magnetic mount also includes a device mount head integrated with the lever arm and one or more magnets that are attractive of a ferromagnetic element on the device. A face of the device mount head is fixed at a prescribed angle relative to the lever arm.

The invention discloses a ferromagnetic cavity physical and magnetic coupling modeling method, and relates to the technical field of electromagnetic property analysis, the method adopts a COMSOL Multiphysics finite element simulation technology, and combines hysteresis loop measurement of a ferromagnetic material, a Jiles-Atherton parameter recognition algorithm, a tensile test, residual magnetism measurement and a force and magnetic coupling test, so that the ferromagnetic cavity physical and magnetic coupling modeling method is realized. According to the method, the magnetization behaviors of the ferromagnetic cavity under the action of different stresses and magnetic fields are accurately simulated, the high-precision force-magnetic coupling simulation model is established by automatically identifying five Jiles-Atherton parameters of the ferromagnetic material and combining mechanics and residual magnetism data, space magnetic field distribution under the specified working condition is rapidly calculated, and the method has the advantages of being high in modeling efficiency and high in calculation precision.

A closed ferromagnetic housing has a pair of access ports and a center ferromagnetic post extending from and between opposite ends thereof. At least one conductor, contained within and completely surrounded by the closed ferromagnetic housing, is wound around the center ferromagnetic post such that the closed ferromagnetic housing, center ferromagnetic post, and at least one conductor form an inductor in which the ferromagnetic housing and the center ferromagnetic post define a core of the inductor and the at least one conductor defines a coil of the inductor. The access ports are configured to permit flow of coolant into the closed ferromagnetic housing and around the center ferromagnetic post to cool the at least one conductor.

Systems and methods to detect ferromagnetic objects, particularly submerged, non-naturally occurring ferromagnetic objects, account for contributions to the magnetic field arising from topography, such as magnetic refraction at bathymetric slopes. Removing this topography component of noise from detected total magnetic field enhances detection capability of, for example, naval surveillance systems.

The invention provides the application of the non-dehydrogenation after hydrogen decrepitation treatment in the aspect of improving the residual magnetism of the neodymium-iron-boron magnet. The hydrogen content of the high-hydrogen-content coarse powder which is not dehydrogenated after the hydrogen decrepitation treatment is 1500-3500 ppm. According to the method, dehydrogenation treatment is not carried out especially in the hydrogen decrepitation treatment process, and the alloy coarse powder with high hydrogen content is obtained and used for improving the residual magnetism of the neodymium-iron-boron magnet. According to the preparation method of the high-remanence neodymium-iron-boron magnet, the production process is creatively designed and improved, the total amount of rare earth is reduced through formula design, the hydrogen content of coarse powder is increased, the coarse powder is sieved to remove impurities, an antioxidant is added into the coarse powder, and the measures of secondary high-temperature sintering and the like are adopted, so that the high-remanence neodymium-iron-boron magnet is obtained. And finally, the oxygen content of the magnet is reduced, namely, the beta non-ferromagnetic phase is reduced, and meanwhile, the density of the magnet is improved, so that the residual magnetism Br of the neodymium-iron-boron magnet is effectively improved.

Apparatus and associated methods relate to separate ferromagnetic impurities from bulk battery materials. In an illustrative example, a ferromagnetic impurity separation system (FISS) may receive a sample vessel including an enclosed sample of bulk battery materials. The FISS, for example, may include a variable magnetic flux generator (e.g., an electromagnet) disposed at a position separated from the sample vessel. The FISS may also include an agitation unit having a translational motor and a rotational motor configured to rotate the sample vessel about a central axis, and to translate a position of the central axis of the sample vessel. For example, in an operation mode, the variable magnetic flux generator and the agitation unit may apply a predetermined magnetic flux, a predetermined angular velocity and a predetermined velocity to the sample vessel. Various embodiments may advantageously separate ferromagnetic impurities from the enclosed sample concisely without contaminating the sample.

The invention aims to provide a mutual inductor fault prediction and judgment method based on an offshore wind power system, and solves the problems faced by a mutual inductor in offshore wind power. In order to achieve the purpose, according to the mutual inductor fault prediction and judgment method based on the offshore wind power system, a multi-physics field joint simulation model is constructed according to the operation condition of an existing offshore wind generating set, LSTM-Kalman hybrid algorithm iterative optimization is completed, implementation is carried out on the offshore wind generating set based on the hybrid algorithm iterative optimization result, and the mutual inductor fault prediction and judgment method based on the offshore wind power system is obtained. A hardware system is upgraded, and finally fault prediction is achieved through the multi-physics field joint simulation model. Aiming at the technical problem of offshore wind power ferromagnetic resonance prediction, the invention provides a closed-loop solution integrating hardware transformation, an intelligent algorithm and system verification. Problems possibly encountered in the mutual inductor are predicted by establishing a model and are automatically processed; and an offshore wind power fault prediction prevention and control system with environment self-adaption, fault pre-judgment and decision self-evolution is formed.

The invention belongs to the field of magnetic materials, and particularly discloses europium-based silicate as well as a preparation method and application thereof. The general chemical formula of the europium-based silicate is Eu2SiO4, and the europium-based silicate is subjected to secondary magnetic phase change from a paramagnetic state to a ferromagnetic state at the magnetic phase change temperature of 5.8 K; and at the temperature of 5.5 K, when the magnetic field change is 0-2T, the maximum magnetic entropy change is greater than 10J. Kg <-1 >. K <-1 >. The europium-based silicate disclosed by the invention generates paramagnetic to ferromagnetic phase change near the liquid helium temperature, is accompanied by a low-magnetic-field giant magnetothermal effect near the magnetic phase change temperature, shows large magnetic entropy change and refrigerating capacity near the liquid helium temperature, and has a wide application prospect in the field of magnetic refrigeration in a liquid helium temperature region.

The invention provides an electric field regulation and control two-dimensional magnetic tunnel junction and a preparation method and application thereof, and belongs to the technical field of spinning electronic devices. The two-dimensional magnetic tunnel junction comprises a bottom electrode, a two-dimensional ferromagnetic material layer I, a two-dimensional ferroelectric material layer, a two-dimensional ferromagnetic material layer II and a protective layer which are stacked in sequence, the two-dimensional ferroelectric material layer adopts CuInP2S6, and migration of Cu ions is regulated and controlled through external voltage. The device can be applied to a high-density magnetic random access memory (MRAM), a high-sensitivity magnetic sensor and a low-power-consumption spin logic device, and has an industrialization prospect.

The invention provides a method for measuring magneton dispersion of an antiferromagnetic thin film material based on a terahertz spectrum. According to the method, a ferromagnetic metal layer sample, an antiferromagnetic layer sample, a heavy metal layer sample and a three-layer film structure sample are prepared, laser pulses are used for inducing the samples to emit terahertz spectra, an electro-optical sampling technology is combined for measurement, and contribution of magneton transmission to the terahertz spectra is separated through data processing. The invention aims to solve the problem that the magneton dispersion property of an antiferromagnetic thin film material cannot be measured in real time at low cost in the prior art. Compared with a traditional method, the method has the advantages of being wide in frequency spectrum range, high in wave number resolution ratio, free of contact and low in cost, and is suitable for different types of antiferromagnetic materials. The method provides a theoretical basis and an experimental basis for researching the spin dynamic characteristics of an antiferromagnetic material and developing a high-frequency spintronics device. The method effectively fills the technical blank in the field of magneton measurement of the antiferromagnetic material.

The invention discloses a stress detection method and system based on multi-modal Gaussian kernel adaptive fusion. The method comprises the following steps: acquiring time sequence signals of magnetic Barkhausen noise MBN and magnetoacoustic emission signals MAE; extracting a multi-dimensional characteristic spectrum matrix, and normalizing the multi-dimensional characteristic spectrum matrix to obtain a characteristic sample; constructing a multi-modal Gaussian kernel adaptive fusion model according to the multi-modal Gaussian kernel product fusion function, and outputting a stress predicted value Z by using the multi-modal Gaussian kernel adaptive fusion model; and quantitatively evaluating the prediction effect of the multi-modal Gaussian kernel adaptive fusion model by using the evaluation function. According to the method, two sensing features of magnetic Barkhausen and magnetoacoustic emission are fused, a feature selection and fusion network architecture based on principal component analysis is constructed, an evaluation method and a model are constructed through a classification machine learning algorithm, and high-robustness, high-precision and high-repeatability detection and prediction of ferromagnetic construction stress are realized.

The invention discloses a spin orbit moment magnetic tunnel junction, a majority gate spin logic device and cascade of the majority gate spin logic device, and the magnetic tunnel junction comprises an electrode layer, an artificial antiferromagnetic reference layer, an insulating tunneling layer, a magnetization free layer and an abnormal spin orbit moment layer which are sequentially stacked from top to bottom, the artificial antiferromagnetic reference layer comprises a first ferromagnetic layer, a non-magnetic spacer layer and a second ferromagnetic layer which are sequentially stacked from top to bottom, and the first ferromagnetic layer has vertical magnetization with a fixed direction; the electrode layer in contact with the first ferromagnetic layer has in-plane polarization to adjust the magnetization direction of the second ferromagnetic layer, and the magnetic free layer has vertical magnetization with variable direction; and the abnormal spin-orbit moment layer in contact with the magnetic free layer has an in-plane magnetization direction to generate an abnormal spin Hall effect, so that the magnetization of the magnetic free layer is overturned, the resistance state of the spin-orbit moment magnetic tunnel junction is changed, and a logic function is realized.

According to one aspect of the present disclosure, a transformer based integrated circuit (IC) package includes a portion including a recess. In some embodiments, a magnetic core disposed in the recess, wherein the recess is configured to provide a space between an interior surface of the recess and an exterior surface of the magnetic core, wherein the magnetic core includes a soft ferromagnetic material. In some embodiments, two or more support structures disposed in the recess and connected to the magnetic core and package portion. In some embodiments, a plurality of conductive traces forming first and second coils disposed about the magnetic core, wherein the first and second coils and magnetic core are configured as a transformer. In some embodiments, a molding material is configured to encapsulate a surface of the package portion and the transformer, wherein the molding material is configured to form a package body.

A magnetic tunnel junction device includes a pillar structure including, from bottom to top, a bottom electrode and a magnetic tunnel junction structure, a top electrode overlying the magnetic tunnel junction structure, and a dielectric metal oxide layer extending from a sidewall of the pillar structure to a sidewall of the top electrode. The magnetic tunnel junction structure contains a reference magnetization layer including a first ferromagnetic material, a tunnel barrier layer, and a free magnetization layer including a second ferromagnetic material. The top electrode includes a metallic material containing a nonmagnetic metal element. The dielectric metal oxide layer may be formed by performing an oxidation process that oxidizes a residual metal film after a focused ion beam etch process, and eliminates conductive paths from surfaces of the pillar structure.

Disclosed is a substrate processing apparatus including chamber having defined therein a processing space for a processing of a substrate, a substrate support unit disposed in the chamber, a gas supply unit configured to supply gas to the interior of the chamber, a plasma generation unit including a high-frequency power supply configured to generate plasma in the processing space, an electromagnet unit configured to generate a magnetic field in the processing space, and a controller. The electromagnet unit includes a coil module and a ferrofluid reservoir disposed adjacent to the coil module. The substrate processing apparatus suppresses heat generation in the coil module and precisely controls a magnetic field.

The invention discloses a ferromagnetic resonance detection and prevention method for a voltage transformer, and belongs to the field of voltage transformer fault monitoring. Whether ferromagnetic resonance exists or not is judged mainly according to the ground capacitive reactance of the voltage transformer and the excitation inductive reactance under the rated line voltage, and if yes, the following steps are executed: a bus zero-sequence voltage signal of the voltage transformer is collected and dispersed; performing windowing processing on the discrete signal by adopting a Hanning window; performing fast Fourier transform on the windowed signal to obtain spectrum signal amplitude distribution; and determining the ferromagnetic resonance type according to the spectrum signal amplitude distribution. According to the method, ferromagnetic resonance can be accurately identified and classified, so that the detection efficiency is improved, the system fault risk is reduced, and the impact of resonance on power equipment is reduced.