16 results about "Magnetic exchange" patented technology

This invention discloses a high-boron Y–Ce–Co co-substituted nanocrystalline material and its preparation method. The general chemical formula of the nanocrystalline material, expressed as a percentage by mass, is: [RE x (Y y Ce 1‑y ) 1‑x ] z Fe 100‑z‑u‑v‑w Co u M v B w The composition is defined as follows: 0 ≤ x ≤ 0.9, 0.05 ≤ y ≤ 0.9, 25 ≤ z ≤ 35, 5 ≤ u ≤ 50, 0 ≤ v ≤ 3, 1.7 ≤ w ≤ 3. This invention utilizes Y–Ce–Co co-substitution to synergistically regulate the lattice occupancy, elemental valence states, and magnetic exchange interactions of the main phase, significantly improving the temperature stability of the Ce-rich system. Addressing the issues of abnormal grain growth and excessive Laves phase precipitation caused by Co introduction, increasing the mass percentage of B significantly enhances the alloy's amorphous forming ability, refines the main phase grains, and suppresses the formation of harmful second phases. Based on this compositional design, a low-linear-velocity melt rapid quenching process (12 to 18 m / s) can directly prepare materials with uniform nanocrystalline structures without subsequent crystallization annealing, achieving high coercivity and high temperature resistance while significantly reducing raw material costs.

Methods and apparatus for devices including TMR elements with a free layer having a vortex layer to provide a magnetic vortex, a spacer layer, a reference layer, and a bias layer to offset the vortex by magnetic exchange bias. Sensor embodiments increase linearity for enhancing sensor performance.

The invention discloses an R-T-B rare earth permanent magnet and a preparation method and application thereof, and belongs to the technical field of permanent magnet materials. The preparation method comprises the following steps that an alloy film R1xFeyGazVw for grain boundary diffusion is attached to the surface of an R-T-B basic magnet, and then the R-T-B rare earth permanent magnet is obtained through high-temperature diffusion and tempering heat treatment, in the alloy film R1xFeyGazVw for grain boundary diffusion, x, y, z and w are the mass percentages of corresponding elements, the total amount is 100%, 51 < = x < = 55.7, 40 < = y < = 44.2, 4.3 < = z < = 9, 0 < = w < = 4.7, R1 is at least one or more of Pr and Nd, and V is at least one or more of Al and Cu. The components of the alloy film are accurately controlled, so that the alloy film can stably form a nonmagnetic phase of 6: 13: 1 composed of rare earth, iron and gallium at the grain boundary of a basic magnet in subsequent heat treatment, the magnetic exchange coupling effect among main phase grains is effectively isolated, and the coercive force is remarkably improved. And the preparation method of the R-T-B rare earth permanent magnet provided by the invention does not depend on heavy rare earth elements.

The micro-motion generator module comprises a metal shell, a rocker arm piece, an elastic piece, a magnetic assembly and an electromagnetic coil assembly, the metal shell comprises a bottom plate and two side plates, and a magnetic conductive cavity is formed between the bottom plate and the two side plates; the rocker arm piece comprises a magnetic bin part, a rotating arm and a force storage arm, the magnetic bin part is located in the magnetic conduction cavity, the rotating arm is connected with the magnetic bin part, and the force storage arm is connected with the magnetic bin part; the elastic piece is connected with the force storage arm; the magnetic assembly comprises a permanent magnet, a first magnetic conductive sheet and a second magnetic conductive sheet, and the permanent magnet is arranged in the magnetic bin part; the electromagnetic coil assembly comprises an iron core and a coil, the iron core is connected with the metal shell, and the coil is wound on the outer side of the iron core. When the rocker arm piece is in the first posture, the first magnetic conductive sheet is in contact connection with the iron core; and when the rocker arm piece is in the second posture, the second magnetic conductive sheet is in contact connection with the iron core, so that the first magnetic conductive sheet, the second magnetic conductive sheet and the iron core have a relatively large contact area, and the magnetic exchange efficiency is improved.

This application relates to the field of microscopy technology, and more particularly to a magnetic high-rigidity leveling adapter for microscopes. The technical solution includes a base fixed to a microscope support column, a support stage, and an adjustment connector. The support stage is equipped with a magnet for rapid sample adsorption. The adjustment connector includes a fixed ball, three bolts with ball heads, and a tension spring connecting the base and the support stage. The bottom surface of the support stage has two vertically aligned V-grooves and a planar contact portion. Each bolt has a hydraulic locking mechanism that controls the horizontal movement freedom of the ball head through a pressing head. During adjustment, pressing the corresponding bolt fixes the ball head at that point horizontally, while allowing the other two ball heads to slide freely, preventing jamming. After adjustment, all horizontal movement of the ball heads is locked. This invention enables non-destructive upgrading of old microscopes, quick sample magnetic exchange, eliminates adjustment drift and jamming problems, and significantly improves imaging stability and operational efficiency.

The present invention provides a method for making anisotropic or isotropic MnBi bonded bulk permanent magnet wherein starting high purity α-MnBi (LTP) mono-crystalline fine feedstock powder particles or c-axis textured polycrystalline coarse powder particles are coated or covered with a single binder coating or a multi-binder coating system. The processed MnBi powder (which is coated or mixed with one or more polymer(s)) is pressed and / or consolidated to produce a dense anisotropic bonded magnet under a magnetic field or a dense isotropic bonded magnet without a magnetic field, at room temperature or elevated temperature. The polymer(s) used herein serve multiple functions: holding the powders together as a binder, isolating powder particles as a boundary phase to reduce magnetic exchange coupling among the particles and thus preferably retain a higher coercivity Hc close to that of the starting MnBi powder, and protecting the powder from oxidation.

The invention belongs to the field of two-dimensional materials, and particularly relates to a magnetic regulation and control technology of transition metal sulfide molybdenum disulfide (MoS2), transition metal manganese (Mn) is taken as an example, the influence of Mn doping on the magnetic performance of a MoS2 film is systematically researched, and the magnetic performance of the MoS2 film can be regulated and enhanced. The quantitative relation between the Mn doping concentration x and the magnetic performance of the Mo1-xMnxS2 film is established through experiments for the first time, it is successfully shown that the magnetic performance of the MoS2 film can be effectively enhanced through Mn doping, the saturation magnetization is 0.0096 emu / mm < 3 > when the saturation magnetization is x-9.7% and is about 3 times that of a sample doped with a small amount of Mn, and the coercive force is about 160 Oe; the magnetic enhanced dual mechanisms of the MoS2 film, namely the local magnetic moment introduced by Mn atoms and enhanced magnetic exchange interaction, are illuminated for the first time. Research on the magnetic performance of the Mo1-xMnxS2 film regulated and controlled by doping of Mn provides reference for expanding the application of the two-dimensional material in spintronics and magnetic storage devices.

The application discloses a cermet and a preparation method and a cutter thereof, wherein the cermet comprises the following components in percentage by weight: TiC: 25-45%; TiN: 9.5-10%; Ni: 25-32%; Mo: 0-12%; and WC: 5-25%. The application takes TiC, TiN hard phases and a Ni binder phase as main raw materials, and adds nano WC thereto. Since WC is a good conductor of electricity, and after the nano WC is solid-solved in the metal binder phase, the outer electrons of W are transferred into the empty orbit of nickel, and the magnetic exchange effect of Ni in the binder phase is weakened. The prepared conductive cermet has a magnetic susceptibility as low as 1.36*10 ‑5 .

Magnetic exchange system for generating synchronized magnetic movement, comprising: a support structure with two concentrically arranged hollow cylinders (cylinder 1 and cylinder 2) made of magnetically insulating material, which rotate around a common axis, wherein both cylinders have radial openings (holes) that are offset from each other in such a way that an opening in cylinder 1 is always covered by a closed wall surface of cylinder 2 and vice versa, at least one track arranged between the cylinders with at least one movable magnet (magnet 1), a magnet (magnet 2) arranged stationary inside cylinder 1 and a magnet (magnet 3) arranged stationary outside cylinder 2; characterized in that the magnetic interaction between magnet 1 and optionally magnet 2 or magnet 3 is controlled via the openings by the rotation of the cylinders in such a way that magnet 1 performs an oscillating movement between the cylinders.

This invention discloses a high-boron Y–Ce–Co co-substituted nanocrystalline material and its preparation method. The general chemical formula of the nanocrystalline material, expressed as a percentage by mass, is: [RE x (Y y Ce 1‑y ) 1‑x ] z Fe 100‑z‑u‑v‑w Co u M v B w The composition is defined as follows: 0 ≤ x ≤ 0.9, 0.05 ≤ y ≤ 0.9, 25 ≤ z ≤ 35, 5 ≤ u ≤ 50, 0 ≤ v ≤ 3, 1.7 ≤ w ≤ 3. This invention utilizes Y–Ce–Co co-substitution to synergistically regulate the lattice occupancy, elemental valence states, and magnetic exchange interactions of the main phase, significantly improving the temperature stability of the Ce-rich system. Addressing the issues of abnormal grain growth and excessive Laves phase precipitation caused by Co introduction, increasing the mass percentage of B significantly enhances the alloy's amorphous forming ability, refines the main phase grains, and suppresses the formation of harmful second phases. Based on this compositional design, a low-linear-velocity melt rapid quenching process (12 to 18 m / s) can directly prepare materials with uniform nanocrystalline structures without subsequent crystallization annealing, achieving high coercivity and high temperature resistance while significantly reducing raw material costs.

Multi-layer magnetoelectric, ferroelectric, and ferromagnetic structures comprising one or more soft layers and one or more hard layers have a lower coercive voltage than magnetoelectric, ferroelectric, and ferromagnetic structures comprising a single layer. The lower coercive voltage of the overall multi-layer structure is due to exchange coupling between the soft and hard layers. The soft layer has a coercive voltage that is lower than the coercive voltage of the hard layer and magnetic exchange coupling between the soft and hard layers during switching makes it easier for the hard layer to switch polarization or magnetization states. The multi-layer magnetoelectric, ferroelectric, and ferromagnetic structures can be used in a variety of spintronic devices, such as capacitors, magnetoelectric spin-orbit (MESO) devices, magnetoelectric magnetic tunneling junctions (MEMTJs), and ferroelectric field effect transistors (FeFETs).

This invention discloses a silver-coated magnetic metal filler with magnetic field shielding effectiveness, its preparation method, and its application, relating to the field of electromagnetic shielding materials technology. The method includes: acid washing of magnetic metal powder to obtain acidified magnetic metal powder; adding the acidified magnetic metal powder to a silver nitrate solution, adding grease, and stirring to obtain activated magnetic metal powder; uniformly mixing the activated magnetic metal powder, reducing solution, and silver ammonia solution, adding grease again, and stirring to obtain the silver-coated magnetic metal filler with magnetic field shielding effectiveness. This invention utilizes lightweight, inert grease to avoid oxidation during the magnetic metal displacement activation or chemical silver plating process, significantly enhancing the electromagnetic exchange between the magnetic core and the conductive shell, further improving its shielding effectiveness.

The present invention provides a method for making anisotropic or isotropic MnBi bonded bulk permanent magnet wherein starting high purity α-MnBi (LTP) mono-crystalline fine feedstock powder particles or c-axis textured polycrystalline coarse powder particles are coated or covered with a single binder coating or a multi-binder coating system. The processed MnBi powder (which is coated or mixed with one or more polymer(s)) is pressed and / or consolidated to produce a dense anisotropic bonded magnet under a magnetic field or a dense isotropic bonded magnet without a magnetic field, at room temperature or elevated temperature. The polymer(s) used herein serve multiple functions: holding the powders together as a binder, isolating powder particles as a boundary phase to reduce magnetic exchange coupling among the particles and thus preferably retain a higher coercivity Hc close to that of the starting MnBi powder, and protecting the powder from oxidation.

The application discloses a kind of microbial spray drying real-time sampling cup, belong to the field of spray drying, adopt heat insulation magnetic paste to simultaneously isolate the heat and magnetic exchange between cup sampling cup inside and outside, further maintain the low temperature environment in inner cup, also prevent the magnetic field of strong magnet from penetrating outer cup and attracting dry particle droplets to affect the spray drying sampling process;By connecting magnet and spray drying tower fixed, to achieve the purpose of non-destructive installation;Upper portion of inner cup, lower portion of inner cup and outer cup are filled with frozen insulation layer, maintain the low temperature environment in inner cup;Strong magnet is placed in anti-freeze liquid at the bottom of outer cup, to achieve the purpose of stable sampling by strong magnetic field to attract spray drying particle droplets loaded with microorganism and high paramagnetic carboxyl iron powder simultaneously. A kind of sampling method is also disclosed, using staircase design, avoids the interference between each sampling cup in vertical arrangement method, plus the installation of arc baffle, greatly improves the stability and accuracy of dry and wet double samples.

An R-T-B permanent magnet having high coercivity, a preparation method therefor and the use thereof. The preparation method for the R-T-B permanent magnet of the present invention comprises: (1) preparing composite magnetic powder, specifically, coating surfaces of base material powder particles with coating material particles so as to obtain the composite magnetic powder; and (2) subjecting the composite magnetic powder in step (1) to press molding treatment and thermal treatment, and optionally performing diffusion treatment, so as to prepare the R-T-B permanent magnet. In the present invention, the surface layers of the base material powder particles are uniformly coated with a grain boundary alloy having a low melting point, which effectively lowers the melting point of a grain boundary phase and reduces the sintering temperature of the permanent magnet, thus greatly reducing the production cost of the permanent magnet; in addition, the bulk phase in the magnet can be uniformly encapsulated by the grain boundary phase, so as to effectively isolate the magnetic exchange coupling effect between bulk-phase grains, and reduce grain boundary defects, thus significantly improving the coercivity of the permanent magnet.

The application belongs to the technical field of magnetic functional materials, and discloses a dense gadolinium-based fluorocarbonate magnetic refrigeration material and a preparation method and application thereof. The chemical formula of the gadolinium-based fluorocarbonate magnetic refrigeration material is NaGdCO3F2. The material is constructed by anti-magnetic sodium ions and fluorine ions and carbonic acid root mixed bridging ligands to form a dense gadolinium-based three-dimensional honeycomb framework structure. The specific spatial arrangement effectively suppresses the magnetic exchange interaction while maintaining high magnetic density, induces short-range magnetic correlation near 0.5K, suppresses the magnetic order temperature to 0.22K, and widens the effective refrigeration temperature range by generating a Schottky abnormal specific heat wide peak. Under 1T, 2T and 7T magnetic fields, the maximum magnetic entropy change reaches 23.1, 38.9 and 59.1 J·kg ‑1 ·K ‑1 respectively. As an excellent low-temperature magnetic refrigerant, the material has the advantages of good thermal stability, simple preparation process and low cost, and has a wide industrial application prospect in the field of adiabatic demagnetization refrigeration materials.