261 results about "High magnetic field" patented technology

The invention discloses a sensor array multi-objective optimization method for magnetic field signal denoising, and the method comprises the implementation steps: building a magnetic field interference model in a constraint mode, carrying out the transient analysis, and obtaining the time sequence data of magnetic field signals collected by all sensors; setting an optimization index, taking the optimization index as a multi-target fitness function, optimizing the multi-target fitness function, and obtaining an optimal auxiliary sensor layout scheme under the condition that the fitness function value is maximum; establishing a main sensor and an optimal auxiliary sensor array based on the optimal auxiliary sensor layout scheme; and in an interference source influence environment, processing a noise signal of the optimal auxiliary sensor array based on the trained deep learning network model to obtain a denoised magnetic field signal of the main sensor, reconstructing a main position noise through sensor layout optimization and auxiliary sensor array noise, and obtaining an optimal auxiliary sensor array. Magnetic field signal denoising under the condition that an object is disturbed is realized, and the precision of magnetic field testing is improved.

The present invention relates to the technical field of measuring magnetic variables, and specifically to a bracket and multi-array control method for adjustable TMR and electromagnetic measurement sensors. The bracket body of the present invention includes a number of fan-shaped bottom plates made of SMC composite materials, and adjacent fan-shaped bottom plates are spliced ​​together to form a complete annular structure; the adjustment mechanism includes a ball screw and a motor, and the ball screw is installed on the track of the bracket body; the electromagnetic measurement sensor includes a carrier and an electromagnetic measurement unit installed on the carrier; the bracket body and the electromagnetic measurement sensor adopt an upper and lower layered layout, and the probe electromagnetic measurement sensor is independently adjusted by the adjustment mechanism, and arranged in an array along the track, thereby forming an adjustable array sensor together. By improving the adjustable bracket structure, the electromagnetic measurement sensor can be flexibly arranged and independently adjusted in an array on the bracket, so as to more accurately detect magnetic field signals at different positions and directions, and improve the efficiency and accuracy of magnetic field detection.

A magnetic orbital angular momentum beam accelerator will accelerate charged particles, electrons or ions, from rest in zero or low magnetic field into a high magnetic field regions with high kinetic energies in the form of magnetic orbital angular momentum. For example, a beam injector that accelerates electrons or ions into 1T magnetic fields with tens of keV kinetic energies transverse to the magnetic fields can be used to heat magnetically confined plasmas, to inject an initial energetic plasma component with high magnetic orbital angular momentum and to produce highly transverse particle momenta to the magnetic field for electron or ion beam lithography.

The invention provides a power communication network risk identification method and system and a storage medium. The method comprises the following steps: acquiring electromagnetic interference environment parameters, acquiring optical cable laying path and tower structure data, and analyzing a distribution rule of grounding points of an electromagnetic shielding layer; the influence of electromagnetic interference on signals is eliminated according to a grounding point distribution rule; acquiring optical cable strain information, and extracting optical cable strain change characteristics; determining an optical cable fault and a fault point initial position; correcting the position of a fault point; evaluating the damage degree caused by the magnetic field; and generating a fault point repair suggestion, updating the optical cable state database, and generating an optical cable health state report focusing high magnetic field influence. By implementing the method, the optical cable fault can be effectively positioned, the damage degree of the optical cable can be accurately evaluated, and the stability of a power communication network can be improved.

The invention provides an electro-permanent magnet uncoiling composite magnetic field multi-mode adjustment system which comprises a data acquisition and preprocessing module, a graph structure construction module, a dynamic prediction module, a historical matching prediction module, a magnetic force adjustment strategy module and an electro-permanent magnet execution mechanism. The data acquisition module constructs a multi-modal data cube through a temperature field, deformation, stress and magnesium powder concentration sensing network; the graph structure module discretizes the steel strip coil into a node network and calculates a mechanical association edge weight; the dynamic prediction module updates node features through the graph neural network and then outputs a sliding probability vector through the LSTM network; the historical matching module screens similar working conditions based on a dynamic time warping algorithm and generates magnetic force preset parameters; the strategy model fuses the probability vector and a preset parameter to generate a partition magnetic matrix; and the execution mechanism realizes millisecond-level magnetic field regulation and control through the reconfigurable magnetic pole array. According to the system, the magnetic field control precision can be improved, the interlayer sliding risk is reduced, and the self-adaptive adjustment effect is achieved.

The magnetorheological damping element based on the winding type magnetic circuit built-in piston comprises a hydraulic cylinder and a magnetorheological damper, the hydraulic cylinder comprises a hydraulic cylinder end cover, a hydraulic cylinder barrel, a double-outlet-rod hydraulic piston and a shared end cover, and the magnetorheological damper comprises a damper outer cylinder barrel, the built-in piston, a wire rod and a damper end cover; the hydraulic cylinder and the magnetorheological damper are connected together through the common hydraulic piston and the common end cover; the magnetic isolation disc is installed between the front magnetic conduction block and the rear magnetic conduction block and is jointly arranged in the magnetic conduction cylinder to form a flow channel baffle, and the interior of the built-in piston forms a magnetorheological fluid flow channel through center flow holes of the front end cover and the rear end cover, gaps between the front end cover and the flow channel baffle, gaps between the rear end cover and the flow channel baffle and gaps between the magnetic conduction cylinder and the flow channel baffle. A winding type magnetic circuit is formed by arranging the magnetism isolating part. The structure effectively utilizes a magnetic field through a guide magnetic circuit, can improve the utilization rate of the magnetic field, can provide damping force matched with the hydraulic cylinder, and is compact in structure and small in size.

The invention belongs to the technical field of magnetic particle imaging, particularly relates to a time sequence magnetic nanoparticle imaging device and method for detecting nerve response activity, and aims to solve the problems that the sensitivity of magnetic particle signal detection is not high, a large coil assembly is needed for achieving high magnetic field intensity, the calculation amount is large, and the calculation mode is complex. According to the device, a signal generator outputs a voltage signal, amplifies the voltage signal and then accesses a selection coil and a driving coil; the two selection coils are arranged in a Maxwell configuration and have the same axis; the driving coils are arranged at intervals of 90 degrees from top to bottom, from left to right and from front to back by taking the FFR as the center; the excitation coil, the receiving coil and the selection coil are coaxial; and the high-pass filter filters the signal received by the receiving coil and imports the signal into a computer through a signal acquisition card for time sequence fMPI image sequence reconstruction. According to the invention, the magnetic particle signal detection sensitivity is improved, the volume of the coil assembly is reduced, the calculation complexity and the calculation amount are simplified, and the magnetic particle imaging robustness is improved.

The invention discloses a water-cooling pulsed high-intensity magnetic field coil, and belongs to the technical field of pulsed high-intensity magnetic fields. The coil adopts a laminated structure, each laminated sheet is provided with an opening and a boss, and a spiral structure is formed through electrical connection of the bosses. Each lamination is divided into a through-flow part, a water cooling part and a fixed part; the through-flow part is made of red copper, the water cooling part and the fixing part are made of stainless steel, and an integrated copper-steel composite structure is formed through welding. The water-cooling part is provided with water-cooling grooves welded and sealed by a cover plate; and the water-cooling grooves of the laminations are connected in series through water inlet and outlet holes to form a cooling flow channel. The fixing part is provided with a semicircular fixing hole used for limiting and flow guiding. And an insulating sheet is arranged between the adjacent laminations. The coil is pressed tightly through the upper and lower pressing plates and an insulated fixing stud. Through lamination partitioning and copper-steel compounding, the high-strength and efficient water-cooling capacity is achieved, and the problems of insufficient strength and cooling of the pulse high-intensity magnetic field coil under repetition frequency work are effectively solved.

To provide a Hall element and a current sensor in each of which high accuracy and high sensitivity can be made compatible with each other even when a high magnetic field is applied to the Hall element and the current sensor, the Hall element and the current sensor consuming low power and being suppressed in reliability variation.SOLUTION: The Hall element comprises a substrate 11 including gallium arsenide, an active layer 12 including indium arsenide, formed on the substrate, having a film thickness of 0.63 μm or more and less than 1.45 μm, and an inactive layer 13 formed on the active layer, having a film thickness of 3 nm or more and less than 100 nm. The film thickness ratio of the inactive layer to the active layer is 0.005 or more and less than 0.067. This enables the provision of the Hall element and a current sensor which can achieve both high precision and high sensitivity even under high magnetic fields, have low power consumption, and suppress reliability variations.SELECTED DRAWING: Figure 1

The invention belongs to the field of magnetic particle imaging, particularly relates to a zero-inertia magnetism gathering ring magnetic-field-free line magnetic particle imaging system and method, and aims to solve the problems of low magnetic field gradient, high magnetic field control complexity and limited imaging space. The current of a gradient magnetic field coil group is generated by a magnetic field control and imaging module, is output by a signal acquisition and output module, and is amplified and provided by a gradient power amplifier module. The current of the axial excitation magnetic field coil is generated by the magnetic field control and imaging module, is output by the signal acquisition and output module and is amplified and provided by the excitation power amplifier module, and a signal received by the multi-axis detection coil is filtered and amplified by the signal processing unit and then is input to the imaging module by the magnetic field control and imaging module for algorithm reconstruction. According to the invention, the magnetic field gradient and the control precision are obviously improved, and the imaging space of the axial fault plane is realized.

The invention relates to the technical field of superconducting material processing, in particular to a preparation method of an Nb3Sn superconducting wire. The method mainly comprises the steps that Nb-Zr alloy is loaded into the exterior and / or the center of a Sn-Cu single-core rod, oxide powder is filled between the Nb-Zr alloy and the Sn-Cu single-core rod, then the Sn-Cu single-core rod and the Nb-Zr alloy are loaded into a copper substrate, and Nb3Sn subcomponents are obtained after multi-pass stretching, forming and fixed-length cutting; and uniformly arranging the Nb3Sn sub-components in the copper pipe along the circumferential direction to form a bundle, and after multi-pass stretching, carrying out heat treatment and cutting to obtain the Nb3Sn superconducting wire. By introducing the artificial point pinning array in density gradient distribution, the critical current density of the Nb3Sn superconducting wire in a high magnetic field of 8T-16T is enhanced, the problems that an existing uniform artificial point pinning center scheme generates a matching effect and limits the actual application of the superconducting wire are solved, and the decline degree of the critical current density of the Nb3Sn superconducting wire in the high field is relieved.

The invention relates to the technical field of industrial detection, in particular to an electromagnetic ultrasonic double-wave transducer for detecting residual stress of a pipeline. The problems that in the prior art, single-wave detection errors are large, the fitting degree of a sensor and a pipeline curved surface is poor, and impact force affects an internal structure are solved. The invention provides an electromagnetic ultrasonic double-wave transducer. The electromagnetic ultrasonic double-wave transducer comprises a shell, a magnet assembly, a coil and other components. The magnet assembly is composed of a transversely-arranged first magnet, a longitudinally-symmetrical second magnet and a longitudinally-symmetrical third magnet, the included angle between the magnets is adjusted through a hinge, and vertical and horizontal magnetic fields are formed to excite transverse waves and longitudinal waves at the same time. The lower portion of the shell is arc-shaped and attached to the curved surface of the pipeline, and an elastic supporting structure and a flexible buffering layer are arranged at the joint to buffer impact force. In addition, a grounding lead is arranged to improve the signal-to-noise ratio. Through multi-magnet combination, the arc-shaped shell and the grounding wire buffer design, the magnetic field uniformity and the detection signal strength are effectively improved, and transverse and longitudinal wave integrated high-precision residual stress detection is realized.

The invention belongs to the technical field of pericarpium citri reticulatae fermentation, and relates to a fermentation temperature control method and system.The fermentation temperature control method comprises the steps that antifouling treatment data of a material is obtained, the water content of a mucus layer in the material is detected, and the total amount of biological metabolism heat production is calculated in combination with the self-weight pressure of the material; the temperature distribution of the fermentation heap is adjusted through coupling control in the three-stage heating and dynamic maintaining stage; the surface flora is guided to migrate to a high magnetic field area at the middle upper part, and the aggregation concentration of the bottom heat-producing flora is inhibited; when it is detected that the water content of the middle layer exceeds a threshold value, the directional water absorption program of the moisture conducting film is activated, and aromatic substances in overflowing liquid are separated and recycled; releasing aroma capture particles according to environment humidity sudden change data, and synchronously opening a directional heat dissipation air channel to balance the temperature difference of a material layer; and analyzing the actual yield of the target component in the finished product, and optimizing the initial control parameters of the next batch based on the deviation ratio with the theoretical value. The method solves the problem that the dynamic heat production rule of the flora growth stage cannot be adapted in real time, and excessive temperature rise or invalid heat dissipation is caused.

The utility model discloses a protection box for high magnetic field chip test, which is used for installing a chip test carrier plate and comprises a shielding box body and an end cover, an accommodating cavity is arranged in the shielding box body, at least one end of the accommodating cavity is open, and the end cover is detachably and fixedly connected to one side of the opening of the accommodating cavity. The end cover is provided with a through groove corresponding to an opening of the containing cavity, the wall of the containing groove is provided with a clamping groove, the groove wall of the through groove is provided with a slot corresponding to the clamping groove, one end, provided with an electronic component, of the chip testing carrier plate penetrates through the slot and then is inserted into the clamping groove, and one end, provided with a chip to be tested, of the chip testing carrier plate is located outside the shielding box body. According to the protection box for the high-magnetic-field chip test, the magnetic shielding effect on the electronic components can be realized only by inserting the electronic components on the chip test carrier plate into the clamping grooves of the shielding box body in a matched manner, the operation is simple, the installation is convenient, and the test efficiency is greatly improved.

An electromagnetic shielding and heat-conducting multi-layer material and a preparation method thereof. The multi-layer material includes an electric field shielding layer, an epoxy heat-conducting adhesive layer, and a magnetic field shielding layer. The electric field shielding layer includes a copper foil layer with a thickness of 5-12 μm. The magnetic field shielding layer has a thickness of 1-3 mm and includes a resin matrix A and carbon fiber cloth. By weight, the resin matrix A includes: 100 parts of bismaleimide resin, 60-68 parts of 3,3-diallylbisphenol A, 32-40 parts of triallyl isocyanurate, 18-20 parts of N,N-dimethylformamide, 100-160 parts of magnetic field shielding filler, 8-10 parts of di-sec-octyl phthalate, and 0.3-0.8 parts of cobalt naphthenate. The magnetic field shielding filler is compounded by nano-manganese zinc ferrite and micron nickel powder in a mass ratio of (80-120):(30-40). The electromagnetic shielding and heat-conducting multi-layer material of the present invention has both electric field and magnetic field shielding functions and is particularly suitable for high magnetic field and high electric field application environments.

The invention provides an error correction method suitable for a three-component magnetic sensor, and the method comprises the steps: building a comprehensive error model of a non-orthogonal error, a sensitivity error and a zero offset error, and solving an error parameter through an intelligent optimization strategy fusing a particle swarm optimization algorithm and a firefly algorithm, thereby achieving the error correction of the three-component magnetic sensor. The method specifically comprises the steps of using a magnetometer to synchronously measure a geomagnetic field module value as a reference standard, combining collected three-component magnetic field data to construct a fitness function, searching an optimal error parameter set by using a particle swarm optimization and firefly fusion algorithm, and compensating the magnetic field data; according to the method, an intelligent optimization strategy based on particle swarm optimization and firefly algorithm fusion is adopted, the magnetic field measurement precision can be effectively improved, and high-precision solving of error parameters and accurate compensation of magnetic field data are achieved.

A magnetic field measurement method based on multi-focus array laser pumping atomic spinning comprises the steps that pumping light is subjected to phase modulation through a spatial light modulator to generate a multi-focus circularly polarized light array, light intensity distribution of focuses of the multi-focus circularly polarized light array on a transverse plane is uniform, and the distances between the focuses of the multi-focus circularly polarized light array are consistent; therefore, the problem of non-uniform distribution of the laser in the transverse direction due to Gaussian light intensity is effectively compensated. In the longitudinal direction, according to the law of energy attenuation caused by the action of light and atoms, the focus light intensity is designed to be gradually enhanced along with the z-axis depth in combination with an anti-Lambert-W function, and a focus array is uniformly focused at the center of an alkali metal gas chamber by expanding the focus depth, so that the transverse and longitudinal polarizability uniformity of alkali metal atoms is remarkably improved, the optical frequency shift virtual magnetic field gradient is inhibited, and the stability of the alkali metal gas chamber is improved. And the common-mode rejection ratio, the signal-to-noise ratio and the response sensitivity of the SERF magnetic field measuring device are improved. The focus array is optimized in real time through detection feedback, efficient compensation and regulation are achieved, and the method is suitable for accurate measurement of the sub-fT-level weak magnetic field.

A mounting opening is arranged on a mounting flange, a mounting step extending along the inner edge of the mounting opening is formed on one side of the mounting opening, a transition ring extends along the inner edge of the mounting step, and quartz glass is positioned on the mounting step and is fixedly welded with the mounting flange through the transition ring. And the quartz glass is welded and fixed at the mounting step of the mounting flange through the transition ring, so that vacuum sealing is realized, sealing materials with poor irradiance such as rubber are effectively replaced, and the device is suitable for ultrahigh vacuum, strong magnetic and irradiation environments such as accelerators, strong magnetic fields, magnetic confinement fusion and the like.

The present invention discloses an electromagnetic gas emergency shut-off valve with a double-spring stable structure. In view of the problems of poor holding force stability of traditional electromagnetic gas emergency shut-off valves and the difficulty in maintenance due to the lack of a quick-disassembly actuator, the present invention removes the double permanent magnets and magnetic conductive sheets in the actuator, and replaces the fixed iron core with a single circular NdFeB permanent magnet. The circular NdFeB permanent magnet cooperates with the magnetic conductive frame to form a magnetic field closed loop, adsorb and lock the moving iron core, thereby simplifying the actuator and improving the magnetic field stability. A support spring (spring one) is arranged between the actuator and the upper valve cover to maintain the vertical stability of the actuator. A rotating snap-on locking structure is arranged between the actuator housing and the upper valve cover to ensure connection and quick disassembly.

The invention discloses an insert magnetic field automatic debugging system and a debugging method thereof. The system comprises a guide rail two-dimensional adjusting structure used for adjusting the straightness of a guide rail structure, and a Z-direction moving motor reducer structure provides power for a moving trolley structure so that the moving trolley structure can move and be positioned on the guide rail structure; the X-direction piezoelectric ceramic and the Y-direction piezoelectric ceramic drive the debugging head motor reducer structure and the debugging head structure to perform X-direction and Y-direction movement and accurate positioning, so that meshing and separation of the debugging head structure and an insertion piece magnetic array magnetic field debugging bolt are realized; the debugging head motor reducer structure drives the insertion piece magnetic array magnetic field debugging bolt to rotate through the debugging head structure to complete magnetic field debugging; the corrugated pipe flange structure and the magnetofluid sealing transmission structure are communicated with the inside and outside of the vacuum barrel of the vacuum inner insert to realize straightness adjustment and power transmission of the guide rail structure; when the system is used for debugging, the speed is high, the precision is high, the magnetic field quality is good, in-situ debugging of the vacuum inner insert can be achieved, the efficiency is high, and the equipment risk is low.

According to the refrigerating system of the magneto-optical measuring device and the control method of the refrigerating system, a GM refrigerating machine is externally arranged, a helium circulation throttling expansion structure is utilized, and ultralow-temperature liquid helium at the temperature of 2K or below is obtained through the GM refrigerating machine under the condition that a large amount of liquid helium is not consumed; the GM refrigerating machine and the optical strong magnetic thermostat are connected through the low-loss infusion tube, and the low-loss infusion tube is fixed through the fixing frame, so that vibration transmitted by the GM refrigerating machine part is filtered out, and the experiment conditions of ultralow temperature, strong magnetic field and ultralow vibration are achieved; meanwhile, after entering the optical strong magnetic thermostat, the cooled liquid helium is divided into two parts which do not influence each other and is respectively used for cooling the sample area and the magnet cold shield, so that the cooling efficiency is improved, and the consumption of the liquid helium is reduced.

According to the vector vortex beam generation method applied to the SERF magnetic field measurement device, a vector vortex beam is generated according to a light field distribution formula of the vortex beam in combination with a computer-generated holography method and a polarization mode decomposition method, then iterative optimization is carried out on parameters such as the phase, the amplitude and the polarization direction in the beam in a global NSGA-II algorithm and local SPGD algorithm combination mode, and finally the vector vortex beam is generated. And then judging whether the electron steady-state polarizability uniformity meets the expectation or not, if so, ending the optimization, taking the optimized light beam as a pumping light beam to pump alkali metal atoms, and carrying out subsequent magnetic field measurement, and if not, changing parameters and continuing optimization until the electron steady-state polarizability uniformity meets the expectation. Compared with a traditional Gaussian beam, the atomic polarizability in the air chamber is stabilized at a required value, the atomic spin gradient field of the device is effectively inhibited, the differential performance of the device is enhanced, and the sensitivity of the SERF magnetic field measurement device is improved.

The invention discloses a magneto-rheological damping spring vibration isolator, which relates to the technical field of dampers and comprises an upper shell and a lower shell, vibration isolation springs are distributed between the upper shell and the lower shell, an oil cylinder is arranged in the center of the lower shell, a cavity is formed in the oil cylinder, a piston is arranged in the cavity, a gap is reserved between the oil cylinder and the piston, and the magneto-rheological damping spring vibration isolator further comprises an auxiliary opening. An auxiliary opening is formed in the piston, an iron core is fixedly arranged in the auxiliary opening, the magnet exciting coil is arranged on the outer side of the iron core, the outer portion of the magnet exciting coil is connected with a control circuit, and the magnet exciting coil is used for controlling the damping of the spring vibration isolator. The damping response speed is increased, the effective action size is reduced in the working state, energy consumption is reduced, when the piston moves to a certain degree due to external impact, the limiting rod and the coil form mechanical contact, displacement is automatically limited, and therefore the effect of protecting circuit components is achieved.

The present invention relates to powered air purifying respirators (PAPRs) and methods to overcome issues associated with their use in high magnetic field environments.

The invention discloses an aluminum smelting high magnetic field area flue gas monitoring signal anti-interference transmission system, which comprises a signal acquisition module, a signal filtering module, a signal correction module and a signal transmission module, and relates to the technical field of aluminum smelting high magnetic field area flue gas monitoring. And by combining a dynamic parameter adjusting mechanism, electromagnetic interference of an aluminum smelting high magnetic field area is effectively filtered out. Meanwhile, the signal correction module corrects error data through trend analysis and CRC verification, distortion components caused by electromagnetic interference are eliminated in combination with spectral analysis and band elimination filtering, the accuracy and integrity of the smoke monitoring signal are remarkably improved, and the problem that noise, errors and distortion in an original signal affect the monitoring precision is solved; and anti-interference of signal transmission is realized through grading marking and path adaptation design of the signal transmission module.

The present invention provides a method, device and electronic equipment for optimizing the magnetic field of a cyclotron main magnet, and relates to the technical field of particle accelerators. A shim block is arranged on the pole face of the main magnet, and the method includes: determining the structural parameters of the pole face, and determining the structural parameters of the shim block based on the structural parameters of the pole face; dividing the pole face into at least two position areas according to the structural parameters of the shim block; determining the magnetic field variation generated by a single shim block in different position areas for each magnetic field area; determining the first current magnetic field of the main magnet and the theoretical magnetic field of the main magnet, and determining the magnetic field difference of each magnetic field area based on the first current magnetic field and the theoretical magnetic field; wherein the magnetic field area includes the position area and the central opening area of ​​the pole face; determining the number of shims set on each position area based on the magnetic field difference and the magnetic field variation, optimizing the isochronism of the magnetic field of the cyclotron main magnet, and improving the accuracy of the magnetic field distribution.

The invention relates to the technical field of magnetic field monitoring, and discloses an aluminum smelting high magnetic field environment operation data real-time monitoring system and method.The aluminum smelting high magnetic field environment operation data real-time monitoring system comprises a difference sequence calculation module, a noise scale calculation module and a difference noise scale calculation module; the step starting point positioning module is used for determining suspected step starting point time; the least square fitting module is used for performing least square fitting to obtain a fitting model; the same-direction lagging wake calculation module is used for calculating a same-direction lagging wake index; the self-adaptive suppression module is used for calculating a decompensated magnetic field amplitude sequence; and the abnormity judgment module judges whether abnormity exists or not according to the mixed energy. According to the method, interference of slow drift of a magnetic field on noise judgment is suppressed through robust noise estimation, then suspected step starting point time is accurately captured through double-index moving average, compensation components are deducted through a fitting model, and a suppression mask is constructed to eliminate wake interference.

This invention relates to the field of magnetic field detection technology and discloses a magnetic field detection method using a CrTe / ZnTe semi-metallic heterojunction grating structure. The method involves establishing a CrTe / ZnTe semi-metallic heterojunction grating structure through material preparation processes and detector operating frequency bands. A magnetic field is then applied to the CrTe / ZnTe grating structure, establishing a theoretical model that correlates the magnetic field strength with the response spectrum characteristics. The designed structure is fabricated using an etching process, and the sample is then packaged and tested. The invention proposes designing a CrTe / ZnTe semi-metallic heterojunction grating structure and utilizing changes in the response spectrum of the CrTe / ZnTe grating structure to detect the magnitude of the external magnetic field. Even slight changes in the magnetic field can affect the magnetoresistance and other properties of the CrTe / ZnTe material, thereby further altering the resonant frequency of the response spectrum of the CrTe / ZnTe grating structure. This method effectively improves the sensitivity, resonant mechanical properties, and temperature stability of magnetic field detection, providing a novel solution for highly sensitive weak magnetic field detection.

The purpose of this disclosure is to provide a heat-assisted magnetic recording (HAMR) writer head with high magnetic field reliability and high accuracy. [Solution] Disclosed are a writer head for a heat-assisted magnetic recording device and a method for manufacturing a writer head. The writer head comprises a plurality of layers, including a waveguide cutoff layer, a waveguide layer, a near-field transducer layer, a heat sink layer, and a peg layer. Each layer has a tapered angle near the air bearing surface. The writer head further has a principal axis pole adjacent to an optical component having a similar tapered angle near the air bearing surface.

The application relates to a relay, a first avoiding part can play the roles of separating, lengthening and blocking an arc, the arc burning time is reduced, and the position of an arc starting point can be controlled. In addition, the first avoiding part is formed at a position with relatively weak magnetic field intensity of at least one of the first contact part and the second contact part, so that the arc starting point position can be controlled at a position with relatively high magnetic field intensity, thereby having a strong arc starting effect, meanwhile, the first avoiding part is adjacent to the arc starting point position, quick arc breaking can be realized, the arc separation effect is obvious, arc ablation of an inner cavity and explosion of the relay and other defects can be effectively avoided, the product performance can be ensured even under high load, and the product failure probability can be reduced.