1197 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.

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.

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 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.

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 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 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.

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.

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 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.

Aa 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 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 relates to a device (1) for the rotary blind embossing of a substrate (3), wherein the device (1) comprises a work station (1a) which comprises a magnetic embossing roller (2a) and a counter-pressure roller (2b), wherein at least one matrix (4a) is magnetically arranged on the magnetic embossing roller (2a) and at least one patrix (4b) is arranged on the counter-pressure roller (2b), wherein the at least one matrix (4a) is multi-layered and has at least one first metal layer (8) made of a ferromagnetic material, wherein the at least one matrix (4a) has a film (7) on the side facing the magnetic embossing roller (2a).

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 disclosure relates to an electronically commutated machine, more particularly an electronically commutated motor having a rotor on a rotor shaft, which rotor shaft can be actuated to rotate. For sensing of an angle of rotation of the rotor shaft, a signaling means is provided, which comprises a retaining element and a magnetic element disposed on the retaining element. A retaining element made of ferromagnetic material is proposed, the magnetic element being placed onto the retaining element from the outside and being retained thereon by magnetic force. The proposal makes it possible to dispense with costly adhesive connections between the magnetic element and the retaining element. The disclosure further relates to an electronically slip-controllable braking system having an electrically commutated machine.

The invention relates to the technical field of material magnetostriction, and discloses a hysteresis and magnetostriction strain simulation method and system for a ferromagnetic material. The non-hysteresis magnetization intensity of the ferromagnetic material is determined by utilizing the magnetization energy of the magnetic moments distributed in all directions on the ferromagnetic material in the magnetic field direction and the total free energy in the magnetic domain, and the magnetic energy density of the ferromagnetic material under the non-hysteresis magnetization intensity is determined according to the non-hysteresis magnetization intensity. According to the principle that the internal energy is minimum when the ferromagnetic material reaches mechanical balance, hysteresis and magnetostriction strain models corresponding to the ferromagnetic material under the condition that stress is applied or not are determined according to the magnetic energy density, so that the accuracy of hysteresis and magnetostriction strain simulation is effectively improved; and the simulation analysis of hysteresis and magnetostriction characteristics is more accurate and diversified.

A device includes a main body having a major portion formed from a ferromagnetic material configured for a dual purpose. The ferromagnetic material serves both a primary functioning purpose (structural, sensing, tracking, or therapeutic) and a secondary electromagnetic tracking purpose. The ferromagnetic material permits determining location and orientation of the device by a sensing system without requiring dedicated tracking sensors or manufacturing changes. The wireless unpowered ferromagnetic material generates trackable electromagnetic signatures when exposed to the magnetic fields, enabling precise location and orientation tracking while maintaining original device functionality without additional specialized sensors. This permits for the leveraging of existing ferromagnetic components like catheter braids, stent structures, or device frames that are already integrated into medical devices for their primary purposes.

The invention provides a preparation method of a low-dimensional insulating ferromagnetic LaCoO3 self-supporting thin film. According to the preparation method, the Ru-based perovskite oxide thin film SrRuO3 (SRO) is inserted to serve as the buffer layer, the problem that the LaCoO3 thin film cannot be stripped from any substrate can be solved, further, the Ru-based perovskite oxide thin film SRO on the surface can be rapidly dissolved within 10 seconds through an electrochemical voltage applying method, and the performance of the LaCoO3 thin film is improved. Therefore, the low-dimensional insulating ferromagnetic LaCoO3 self-supporting film with a clean surface can be efficiently obtained.

The invention discloses a resonance elimination method and system based on a PT primary side neutral point connected with a zinc oxide nonlinear resistor, and belongs to the technical field of ferromagnetic resonance suppression in an electric power system. The method comprises the following steps: collecting a real-time zero-sequence voltage amplitude and a real-time zero-sequence current amplitude; obtaining the maximum real-time signal frequency; judging the relationship between the maximum real-time signal frequency and a signal frequency threshold value so as to identify the type of ferromagnetic resonance; and according to the type of the ferromagnetic resonance, selecting and controlling the disconnection or connection of the zinc oxide nonlinear resistor so as to suppress the ferromagnetic resonance. Two zinc oxide non-linear resistance valve plates with different volt-ampere characteristics are connected to the neutral point of the primary side of the PT, the zero-sequence voltage and the zero-sequence current are combined to comprehensively judge and control the power electronic switch to input one resistor, and the purpose of effective resonance elimination is achieved.

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.

Implantable transponders comprising no ferromagnetic parts for use in medical implants are disclosed herein. Such transponders may assist in preventing interference of transponders with medical imaging technologies. Such transponders may optionally be of a small size, and may assist in collecting and transmitting data and information regarding implanted medical devices. Methods of using such transponders, readers for detecting such transponders, and methods for using such readers are also described.

The invention belongs to the field of quantum sensors, and discloses a diamond spin quantum sensor and a preparation method thereof. The preparation method comprises the following steps: cleaning and polishing a monocrystal diamond substrate; a microwave plasma chemical vapor deposition method is adopted for preparing a diamond film with the nitrogen-vacancy color center density larger than 10 < 16 > cm <-3 > on the single crystal diamond substrate; and preparing an anti-ferromagnetic NiO film on the diamond film by adopting a radio frequency magnetron sputtering method to obtain the diamond spin quantum sensor. The diamond spin quantum sensor disclosed by the invention contains a high-concentration nitrogen-vacancy color center diamond film, and nitrogen-vacancy color center measurement has extremely high spatial resolution, so that the change of a nano-scale magnetic field can be detected; the diamond spin quantum sensor is applied to precise measurement of the magnetic moment of an antiferromagnetic film and the magnetic coupling effect of an antiferromagnetic / ferromagnetic heterojunction interface. And the preparation method is simple, economical and applicable, and provides possibility for application of the diamond nitrogen-vacancy color center material in the field of quantum magnetic sensors.

A method for determining mechanical stress in ferromagnetic pipes (10), wherein magnetic fields (23) are introduced into the pipe (10) wall at at least two different frequencies, the resulting magnetic field (15) is measured with a magnetic sensor (30) and then converted into a predictive value for the existing mechanical stress within the pipe (10), by using a predefined calibration method that analyses the magnetic field(s) measured at a specimen (11) at the different frequencies.