451 results about "Magnetic moment" patented technology

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 discloses a detection method of an ocean magnetic field sensor based on a diamond NV color center. The detection method comprises the following steps: S1, calibrating a base line; s2, alternately measuring fluorescence between two single quantum resonance frequencies, and obtaining a difference to realize DQ reading; s3, three-axis compensation current is adjusted based on closed-loop control, and the NV working point is maintained at zero magnetization bias; s4, obtaining background magnetic field change through digital demodulation and adaptive filtering; and S5, calculating a gradient based on the spatial difference of the multi-point light spots, judging the existence and trajectory of the underwater vehicle in combination with a threshold value and a spectrum matching method, calibrating the threshold value according to the magnetic field characteristics of the existing underwater vehicle, adopting short-time Fourier transform signal spectrum, comparing the threshold value with known submarine characteristic spectrum data, and prompting if the similarity exceeds a set threshold value. According to the detection method, the measurement precision and the anti-interference capability can be improved, and the method is suitable for real-time monitoring of weak magnetic anomalies (such as magnetic moment disturbance of an underwater vehicle).

The invention discloses a transient electromagnetic and magnetic method data joint inversion method. The method comprises the following steps: acquiring transient electromagnetic observation data and magnetic method observation data; converting the transient electromagnetic observation data into transient electromagnetic moment data; based on the transient electromagnetic moment data and the magnetic method observation data, a joint inversion objective function is constructed, and the joint inversion objective function comprises a data fitting residual term and a model constraint term; performing parameter coupling on the model constraint term by using a multivariate Gaussian mixture model to obtain a coupled model constraint term; and combining the data fitting residual term and the coupled model constraint term into a final objective function, and minimizing the final objective function through an optimization algorithm to obtain an electrical parameter and a magnetic parameter of the underground medium. According to the method, transient electromagnetic and magnetic method data joint inversion is realized, the problem of low three-dimensional inversion calculation efficiency is solved by introducing transient electromagnetic moment, and electrical and magnetic parameters are coupled by utilizing rock physics constraint, so that the inversion result is more accurate, and the structure is more consistent.

The present application is drawn to a system and method, as well as method for manufacture of a device and system for determining the position and orientation of at least one magnetic field sensor comprising: a rigid structure comprising an array of at least five electromagnetic coils; at least one wire that connects to and powers the electromagnetic coils; wherein the placement and orientation of the electromagnetic coils on the rigid structure are predetermined; wherein the electromagnetic coils, each having a predefined magnetic moment per unit current, are constructed with a printed circuit board (PCB) comprising at least one conductive layer; and wherein the system is configured such that a stray magnetic field emanating from the at least one, as measured at the location of the at least one magnetic field sensor, generates substantially lower magnetic field intensity than that produced by each of the at least five electromagnetic coils.

The invention discloses a spinning spacecraft nutation characteristic analysis method and an active suppression system. The spinning spacecraft nutation characteristic analysis method comprises the following steps: step 100, decomposing a whole satellite system into a satellite platform body, a three-axis superconducting magnet system, a rotary separation device, a momentum exchange device and a separable load according to the structural characteristics of the whole satellite system; and step 200, based on the orbit and structural characteristics of the satellite, proposing a derivation hypothesis about a whole-satellite kinetic equation so as to construct an ideal modeling environment. According to the nutation characteristic analysis method of the partial spinning spacecraft, mass mutation is added, the analysis method can be used for on-orbit delivery spacecrafts and can also be used for other spacecrafts with mass mutation characteristics, a fuzzy pid control method is adopted in the control method, parameter adjustment is conducted on pid through a fuzzy rule base, the parameter adjustment efficiency is high, and the parameter adjustment accuracy is high. The executing mechanism is a superconducting magnetic moment device, control moment is generated through interaction of superconducting magnetic moment and a geomagnetic field for active suppression, and regulation and control are flexible.

The invention provides a magnetic memory, a magnetic memory unit and a magnetic memory system. The magnetic memory at least comprises a first antiferromagnetic layer, a free layer, a barrier layer, a reference layer and a second antiferromagnetic layer which are sequentially stacked from bottom to top, wherein the magnetic moment direction of the reference layer is a first direction, the magnetic moment direction of the free layer is a second direction, and the first direction is perpendicular to the second direction; when the magnetic memory is in a first mode, applying a current parallel to a second direction to the first antiferromagnetic layer, so that the magnetic moment direction of the free layer is changed from the second direction to a direction parallel to the first direction, and the magnetic memory is switched from the first mode to the second mode; the first mode is used for detecting a magnetic field around the magnetic memory; the second mode is used for data storage. Therefore, the magnetic memory can be switched from the sensing mode to the storage mode, and the occupied space and cost can be saved at the same time.

The invention provides a magnetic random access memory and a preparation method thereof. The magnetic random access memory is applied to a comparison circuit, and comprises a magnetic tunnel junction comprising a free layer, a barrier layer and a reference layer which are stacked in sequence; the spin-orbit torque layer is located on the side, away from the reference layer, of the free layer, the conductive material layer is located on the side, away from the spin-orbit torque layer, of the magnetic tunnel junction, and a conductive material of the conductive material layer has the following characteristics that spontaneous magnetization capacity is achieved, and the resistance temperature coefficient is smaller than 0; the conductive material layer comprises a first part and a second part which are arranged at an interval, the first part is in contact with the reference layer, a first input end of the comparison circuit is electrically connected with the first part, and a second input end of the comparison circuit is electrically connected with the second part. According to the invention, the technical problems that the reading window of the magnetic tunnel junction becomes small and even the reading is wrong and the magnetic random access memory needs to apply an auxiliary magnetic field along the current direction to realize the deterministic overturning of the magnetic moment are at least solved.

Provided is a magnetic moment measurement system and method, which belong to the technical field of magnetic moment measurement, and solve the problems of insufficient accuracy, low efficiency, and vulnerability to disturbance from an external magnetic field in the existing magnetic moment measurement technique. The magnetic moment measurement method includes the following steps: acquiring a magnetic field vector and a magnetic gradient tensor at a center of a magnetic sensor array through the magnetic sensor array; calculating an angle of a magnetic moment vector; and according to the angle of the magnetic moment vector, selecting a corresponding magnetic moment inversion formula, and calculating the magnetic moment vector. By constructing the magnetic sensor array, and using the advanced inversion algorithm, this application not only significantly improves the magnetic moment measurement accuracy, but also greatly shortens the measurement cycle, simplifies the measurement system, and reduces the measurement error.

The invention discloses an aviation transient electromagnetic pod coil attitude correction method and system, and belongs to the field of aviation geophysical exploration, and the system comprises a surface scanning industrial camera module which is used for obtaining the image information of a suspension coil in real time; the industrial-grade integrated navigation module is used for outputting inertial navigation data; the time synchronization and data acquisition module is used for establishing a time unification mechanism; the visual processing module is used for extracting the image processed by the time unification mechanism to obtain visual features; the inertial navigation resolving module is used for obtaining an inertial navigation state of a coil attitude angle through angular velocity integration; the data fusion and attitude estimation module is used for performing fusion calculation by combining the visual features and the inertial navigation state to obtain a fusion result; and the projection area and magnetic moment calculation module is used for calculating the ground projection area and the effective emission magnetic moment component of the coil according to the fusion result. According to the method, the system complexity and the electromagnetic interference risk caused by multi-inertial navigation layout are reduced, and the detection precision and stability of the aviation transient electromagnetic data are improved.

The invention discloses a high-frequency electronic scale inhibition and removal system, and relates to the technical field of scale inhibition and removal equipment of water devices, the high-frequency electronic scale inhibition and removal system comprises a plurality of single equipment arranged outside a water pipeline and used for scale inhibition and removal, each single equipment comprises a body and a conduction ring, and an emission control module, an electromagnetic conduction module, a communication module and a monitoring module are arranged in the body; a display screen is arranged outside the body, the conduction ring penetrates through the body and surrounds the water pipeline, the conduction ring comprises a plurality of connecting blocks, and the connecting blocks are connected through fastening bolts; additional magnetic moment, additional energy and an additional electric field are caused in water through high-frequency electromagnetic waves, a microcrystalline molecular structure separated out of water treated by the electromagnetic waves is loose, calcium carbonate of the crystal lattice is not prone to being attached to the pipe wall, the scale inhibition effect is achieved, more small water molecule clusters or monomer water molecules are generated, the permeation effect is enhanced, and the corrosion resistance is improved. And the scale inhibitor is easier to go deep into a scale layer to disintegrate and loosen scale, and gradually falls off under the impact of water flow, so that scale inhibition and removal are realized.

The invention provides a multi-magnetic accurate positioning method based on APSO-LM fusion, and solves the technical contradictions that global search and local convergence are unbalanced and the resolving efficiency is low in the existing multi-magnetic accurate positioning technology. The method comprises the following steps: constructing a magnetic moment calibration module, selecting a sensor array calibration point, collecting magnetic field data, and calculating a precise magnetic moment amplitude based on a magnetic dipole model; an NSS-VMGT initial positioning result is input through a parameter initialization module, APSO and LM algorithm parameters are configured, and particle vectors are normalized; generating a particle swarm by using an APSO global search module, and iteratively screening a global optimal parameter as an LM initial value; calculating a residual error and a Jacobian matrix by means of an LM local refining module, and iteratively optimizing and outputting a magnetic source position and a magnetic moment; and the dynamic compensation module is used for calibrating clock skew and inhibiting environment interference. The device is realized based on STM32H743, and comprises a 7 * 7 lis2mdltr sensor array, a dual-chip data acquisition link, an APSO-LM algorithm hardware acceleration module and an upper computer interaction unit.

The invention provides a Fe3O4 nano-particle microscopic imaging detection method based on left-handed and right-handed polarization modulation, belongs to the technical field of photo-thermal science and detection and signal processing, and solves the problems that at present, nano single particles are difficult to observe, and the physicochemical characteristics are difficult to obtain, the method specifically comprises the steps that a to-be-detected sample is determined, and a slide sample is prepared; starting a computer, a data acquisition card, a lock-in amplifier, a galvanometer controller and a function generator; starting an exciting light and probe light laser power supply and a refrigerator; detection parameters, laser power / current parameters and modulation parameters are set, and scanning detection is conducted on the detection sample piece; loading a magnetic field; the computer reads a signal from the data acquisition card to obtain a photo-thermal detection result image; different laser parameters and magnetic field sizes are changed, the steps are repeated, circular dichroism and magnetic circular dichroism detection results are obtained, magnetization curve measurement is carried out, and the single nanoparticle magnetic moment overturning process is monitored.

The invention provides a magnetic code disc film material and a preparation method and application thereof. By introducing the TiN layer, a proper amount of nitrogen atoms can enter lattice gaps of iron, electron cloud distribution of iron atoms is changed, and the magnetic moment of the iron atoms is changed; the magnetic moment of Fe atoms can be influenced by N atoms and crystal structures, an alpha-Fe8N phase is formed in FeCoCr through introduction of N ions, the average magnetic moment of each Fe atom in the alpha-Fe8N phase is 2.4 mu B, alpha-Fe8N is a metastable phase, a sample can finally form stable gamma '-Fe4N through annealing, and the magnetic moment of the stable gamma'-Fe4N is generally about 2.5 mu B-2. 7 mu B and is higher than the magnetic moment 2.2 mu B of the Fe atoms in metal Fe; besides, Ti forms a Ti-Fe weak magnetic phase pinning magnetic domain wall in the FeCoCr thin film, and the coercive force and residual magnetism of the FeCoCr layer can be effectively improved at the same time through the method.

The invention provides a calculation method and device of an iron-based biphase magnetic material capable of enhancing magnetic moment. The calculation method comprises the following steps: providing crystal structure samples of a soft magnetic material and a hard magnetic material; optimizing the crystal structure samples of the soft magnetic material and the hard magnetic material to obtain a crystal structure with lowest energy; compounding the multi-layer soft magnetic material structure layer and the multi-layer hard magnetic material structure layer to obtain an initial crystal structure of the biphase magnetic material; wherein interface pinning exchange coupling is formed between the soft magnetic material structure layer and the hard magnetic material structure layer; calculating to obtain the magnetic moment of the crystal structure of the new biphase magnetic material; and regulating the number of soft magnetic material structure layers and hard magnetic material structure layers in the initial crystal structure of the double-phase magnetic material, calculating the magnetic moment of the double-phase magnetic material again, and taking the crystal structure of the double-phase magnetic material with the maximum magnetic moment as the target crystal structure of the double-phase magnetic material.

The invention relates to a field emitter, a driving control method and device thereof and a storage medium, and the field emitter comprises a plurality of rotating magnet units; a reference axis is defined in the rotating magnet unit, the rotating magnet unit comprises a magnet capable of rotating around the reference axis, and the magnetic moment direction of the magnet is perpendicular to the reference axis; the reference axes of the at least two rotating magnet units are perpendicular to each other. The field emitter provided by the invention is formed by at least two rotating magnet units, and the magnetic moment combination of the magnets of the two rotating magnet units can sweep over three orthogonal space directions, so that the use requirements of the field emitter are met. Therefore, the invention provides a simple and effective field emitter configuration, and solves the problems that the conventional field emitter is not provided with a simple and effective specific configuration, so that a technician needs to construct the field emitter according to own experience, and the field emitter configuration is complicated and does not meet the use standard.

The invention belongs to the field of magnetic target body positioning, and relates to a measuring line vertical gradient-based magnetic multi-target positioning and magnetic moment inversion method, which comprises the following steps of: obtaining a unit orthogonal primary function and a primary function coefficient corresponding to each component of magnetic anomaly gradient data vertical to a measuring line, and calculating an energy curved surface of the magnetic anomaly gradient data vertical to the measuring line; detecting a local energy peak value of the energy curved surface, obtaining an energy peak value ratio sequence, obtaining a target number and horizontal position estimation corresponding to the target according to an energy sudden change value in the energy ratio sequence, and calculating a target depth corresponding to a measuring line vertical magnetic anomaly gradient energy extreme value by using a dichotomy method, and constructing a linear equation set about the target magnetic moment by using the measuring line vertical magnetic anomaly gradient data and the unit orthogonal basis function, and obtaining target magnetic moment parameter estimation through a least square method. According to the invention, the anisotropy difference of the estimation precision of the horizontal position of the target is effectively reduced, and the problem of target detection omission caused by large difference between the target burial depth and the magnetic moment module value in multi-target positioning is improved.

The invention provides a permanent magnet magnetizing control method based on magnetic domain dynamics and a magnetizer, and particularly relates to the technical field of permanent magnet magnetizing. Obtaining a three-dimensional model of the permanent magnet to be magnetized, and dividing the three-dimensional model into a plurality of magnetic domain units; obtaining a magnetic moment kinetic equation of each magnetic domain unit; magnetic moment directions of the magnetic domain units are randomly distributed when magnetizing is not carried out, the magnetic moments of the magnetic domains do spin precession under the action of an effective magnetic field, and the magnetic moment directions approach to the direction of the effective magnetic field; the magnetic moment direction of each magnetic domain unit at different moments is subjected to numerical solution, and the change track of the magnetic moment direction of the magnetic domain unit from the initial magnetic moment direction is determined according to the instantaneous magnetic moment direction of the magnetic domain unit at different moments; and determining the consistency degree of the magnetic moment direction of each magnetic domain unit according to the change track, and generating a relation graph of the magnetizing saturation, the pulse magnetic field intensity and the pulse duration. According to the method, the magnetizing precision and efficiency can be improved.

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.

The invention provides a magnetic field control self-checking system and method for a nuclear magnetic resonance gyroscope, and belongs to the technical field of nuclear magnetic resonance gyroscopes, test parameters are input from an upper computer, an AD signal acquisition circuit converts triaxial magnetic field driving current into digital signals, and the digital signals are simultaneously transmitted to an FPGA operation core; according to the magnetic moment precession amplitude-frequency equation, magnetic moment precession signals are calculated through the test parameters and the digital signals; the amplitude, the frequency and the phase information of the signal are input into the gyro output signal generation module; generating a high-frequency carrier sinusoidal signal carrying low-frequency change characteristics from the amplitude, frequency and phase information of the magnetic moment precession signal through a CORDIC algorithm, and simulating a gyro output signal; and the DA conversion circuit outputs a simulated gyro output signal to test the magnetic field control system, so that rapid self-inspection and performance optimization of the magnetic field control system without real operation of gyro equipment are realized, and the system is used for independent test and evaluation of the magnetic field control system and is suitable for popularization.

The invention discloses a wide-temperature-zone multi-degree-of-freedom cantilever beam magnetic moment testing system, and relates to the technical field of physical property measurement, the wide-temperature-zone multi-degree-of-freedom cantilever beam magnetic moment testing system comprises a hollow sample rod and a supporting frame, the supporting frame is provided with a temperature sensor, and the wide-temperature-zone multi-degree-of-freedom cantilever beam magnetic moment testing system further comprises a sample holder, a first rotating mechanism, a first driving mechanism, a second driving mechanism and a reset component, through cooperation of the first rotating mechanism, the first driving mechanism, the second driving mechanism and the like, a pull rope transmission mode is adopted, and compared with a gear transmission mode in the prior art, on the one hand, the cooling capacity leakage speed is reduced, and the accuracy of detection data is improved; secondly, the cable arrangement mode is simple, and the wiring difficulty in the prior art is reduced; thirdly, the problems that in the prior art, a cable is prone to rotating along with the hollow sample rod, poor contact is prone to occurring, the cable is abraded, and the service life of equipment is short are solved; fourthly, compared with gear drive, the pull rope drive is small in return stroke difference, and the measurement precision is improved.

The invention discloses a multi-layer thin film structure capable of achieving vertical exchange bias and free of external field auxiliary total current overturning and a preparation method and application thereof, the multi-layer thin film structure sequentially comprises a heavy metal base layer, an atomic level intercalation layer, a ferromagnetic layer and an antiferromagnetic layer from bottom to top, and the multi-layer thin film structure is prepared through molecular beam epitaxy. According to the invention, anisotropic epitaxial strain is introduced into the antiferromagnetic layer, so that a remarkable vertical exchange bias effect at room temperature is realized. Meanwhile, a global uncompensated magnetic moment is generated in the anisotropic epitaxial strain induction antiferromagnetic layer, an energy barrier of vertical exchange bias flipping is reduced, current-driven exchange bias flipping without an external field is further realized through a spin-orbit moment effect, the dependence on an external magnetic field in the prior art is overcome, and the performance of the device is improved. And the integration and the application potential of the spinning electronic device are obviously improved. The technology lays a foundation for design and development of efficient and high-density magnetic storage and logic devices.

The invention discloses a spin current spatial distribution and polarization direction adjustable spin electronic device, which comprises a substrate, and is characterized in that the substrate is provided with a non-magnetic spin source layer, a ferromagnetic layer arranged on the non-magnetic spin source layer and a current reforming layer arranged on the ferromagnetic layer; specifically, the non-magnetic spin source layer and the ferromagnetic layer form a heterojunction, and a current reforming layer with a specific plane geometric structure grows on the heterojunction. According to the invention, anisotropic magnetic moment flipping of the spin torque and full electromagnetic moment flipping of the spin torque are realized.

The invention provides an indoor local magnetic field modeling method and device based on a magnetic source equivalence principle, and belongs to the technical field of indoor localization, and the method comprises the steps: collecting the data of a three-axis magnetometer in a space range through an array type magnetic sensor, and obtaining the original measurement information of an indoor magnetic field; based on a magnetic source equivalence principle, an indoor magnetic field is modeled into an equivalent magnetic dipole model consisting of a plurality of equivalent magnetic dipoles, and a magnetic field generated by the model is consistent with a real magnetic field in an observation area by setting magnetic moment and position parameters of the magnetic dipoles; according to the measured value of the array type magnetic sensor, an observation model is established in combination with an equivalent magnetic dipole model and used for describing the relation between the measured value and model parameters; through a nonlinear least square optimization method, parameters of the equivalent magnetic dipole model are solved according to the observation model, the equivalent magnetic dipole model of the indoor magnetic field is obtained, and the parameters comprise the magnetic moment and the position of the magnetic dipole. The precision and the reliability of the model are remarkably improved.

The invention relates to the technical field of pipeline detection, in particular to an intelligent non-contact pipeline detection system based on a metal magnetic memory effect, and provides the following scheme: dividing a to-be-detected pipeline into a plurality of grid units, obtaining self-leakage magnetic field data of each grid, constructing a magnetic moment matrix, and forming a magnetic field matrix; according to the method, abnormal grids are positioned based on a magnetic field matrix, a grid with the highest abnormal score is selected from a spatially continuous abnormal set through screening logic to serve as a seed grid, authenticity of adjacent abnormal grids is verified step by step in combination with a local inversion window and magnetic flux continuity constraint, false anomalies caused by magnetic flux diffusion or noise are eliminated, and the accuracy of the abnormal grids is improved. Performing magnetic moment matrix updating on the confirmed real defect grid; and finally, calculating a magnetic gradient modulus by utilizing the updated magnetic moment matrix and determining a damage grade. Adjacent lattice infection can be effectively inhibited, the defect positioning precision and the damage evaluation reliability are improved, and the method is suitable for a non-contact inspection scene of an in-service pipeline.

The invention provides a low-magnetic-leakage excitation coil design method and device capable of generating a high-uniformity magnetic field, and belongs to the technical field of magnetic field control, and the method comprises the steps: determining the target magnetic induction intensity and the length of a target uniformity region; based on a pre-constructed two-dimensional distribution function of the uniform region length and the central magnetic field intensity, determining the size parameters of the low-magnetic-leakage excitation coil corresponding to the target magnetic induction intensity and the target uniform region length by using an interpolation method or a table look-up method; based on the size parameters and the condition that the magnetic moment of the low-magnetic-leakage excitation coil is zero, the ratio of the number of turns inside and outside the low-magnetic-leakage excitation coil is determined; based on the required target magnetic induction intensity and target uniform region length, the designed low-magnetic-flux-leakage excitation coil enables the system to be in a low-magnetic-flux-leakage state externally, magnetic interference to surrounding equipment is reduced, and the measurement precision is effectively improved.

The embodiment of the invention provides a physical unclonable function generator and a true random number generator. The physical unclonable function generator comprises a storage array and a control unit, a storage unit in the storage array comprises a magnetic storage device, and the magnetic storage device comprises a magnetic tunnel junction; the control unit is used for controlling the application of a magnetic field along a target direction to the storage array, and reading the resistance state of the storage unit to generate a physical unclonable function after the application of the magnetic field is stopped; wherein the target direction is perpendicular to or approximately perpendicular to the magnetic moment direction of the free layer in the magnetic tunnel junction in the in-plane direction, and the randomness and uniformity of the physical unclonable function are improved.

The invention provides a self-excited cesium optical pump atomic magnetometer and a magnetic field measurement method. The magnetometer comprises a physical probe part and a circuit part. The physical probe part comprises a cesium spectrum lamp, an optical element, a cesium atom absorption gas chamber, a radio frequency coil and a photoelectric detector; the circuit part comprises a photoelectric conversion circuit, a phase-locked amplification circuit and a radio frequency excitation circuit modulated by square waves. A macroscopic magnetic moment is generated by pumping cesium atoms through left-handed circularly polarized light, a radio frequency magnetic field induces Larmor precession, light intensity changes are detected and fed back to a radio frequency coil to form self-oscillation, and the external magnetic field intensity is calculated according to the linear relation between oscillation frequency and the magnetic field. Square wave modulation is adopted to broaden the measurement bandwidth, a magnetic field direction adjusting system is additionally arranged to automatically keep an angle of 45 degrees between an optical axis and a magnetic field so as to eliminate a blind area, the hemisphere automatic switching function is achieved, and the advantages of being high in sensitivity, fast in response, high in adaptability, small in size and low in power consumption are achieved.

The present application relates to a write head, a write head device, a write head manufacturing method and a magnetizing method. The write head comprises: a second wafer, comprising a silicon body, and a first oxide layer and a second oxide layer which are located on the upper surface and the lower surface of the silicon body, respectively; and a magnetic pole array penetrating through the silicon body, and having a magnetic pole writing end located above the second oxide layer and directly facing one Z-bridge arm, and a magnetic pole supporting end surrounded by the first oxide layer, the magnetic pole array being a hard magnetic pole array, and having a magnetic moment in a +Z-direction or a -Z-direction; or the magnetic pole array being a soft magnetic pole array surrounded by a primary coil, and direct current passing through the primary coil and generating a magnetic moment in the +Z-direction or -Z-direction in the soft magnetic pole, wherein during writing, the magnetic pole writing end generates in a pinning layer of the Z-bridge arm a direct-current writing magnetic field comprising a Z-direction component, so that the magnetic moment of the pinning layer turns to the direction of the direct-current writing magnetic field comprising the Z-direction component. The present invention has the advantages of simple structure, high writing efficiency, low price and the like.

The invention relates to a magnetic control method for a single-axis sun-oriented stable attitude of an optical microsatellite, and relates to the technical field of aerospace. The magnetic control method comprises the following steps: step 1, modeling optical microsatellite attitude dynamics adopting magnetic control; 2, calculating the posture of the single axis to the sun; 3, calculating an attitude control expected moment; and 4, calculating the expected magnetic moment of the magnetic torquer. According to the magnetic control method for the single-axis sun-oriented stable attitude of the optical microsatellite, the single-axis sun-oriented stable attitude control of the satellite can be realized under the condition of extremely low power consumption, and the energy stability of a non-task long-term mode and the reliable operation of the satellite can be ensured.

The invention provides a positioning system and method for a permanent magnet target in a gastrointestinal tract. The positioning system comprises a magnetic source, a magnetic sensor array and a processing module, the magnetic source is used for generating a magnetic field; the magnetic sensor array is used for measuring the magnetic field intensity in the space; and the processing module acquires magnetic field intensity data, and further performs spatial position and orientation calculation of the target by using the magnetic moment and magnetic field intensity data of the magnetic source based on a magnetic dipole model and a magnetic moment theory. By means of the innovative magnetic field induction technology and the magnetic dipole model, the problems that in the prior art, positioning of an electronic capsule in the gastrointestinal tract is insufficient in precision, large in external interference, difficult in posture information obtaining, incapable of meeting the requirement for precise diagnosis and treatment in modern medical treatment and the like are solved, and permanent magnet target positioning in the gastrointestinal tract can be achieved.