The present disclosure provides a method of producing a magnetic powder capable of providing a bonded magnet having a high remanence. The present disclosure relates to a method of producing a magnetic powder, including: 1) mixing an alkyl silicate with an acidic solution; 2) mixing the resultant alkyl silicate mixture with a SmFeLaN anisotropic magnetic powder; and 3) mixing the resultant magnetic powder mixture with an alkali solution.

The present disclosure aims to provide a bonded magnet having good magnetic properties and a method of preparing the bonded magnet. The present disclosure provides a method of preparing a bonded magnet, including: a first compression step of compressing a magnetic powder having an average particle size of 10 μm or less while magnetically orienting it to obtain a first molded article; a second compression step of bringing the first molded article into contact with a thermosetting resin having a viscosity of 200 mPa.Math.s or less, followed by compression to obtain a second molded article; and a heat treatment step of heat treating the second molded article.

A method of producing a SmFeN-based rare earth magnet, the method including: dispersing a SmFeN-based anisotropic magnetic powder comprising Sm, Fe, and N using a resin-coated metal media or a resin-coated ceramic media to obtain a dispersed SmFeN-based anisotropic magnetic powder; mixing the dispersed SmFeN-based anisotropic magnetic powder with a modifier powder to obtain a powder mixture; compacting the powder mixture in a magnetic field to obtain a magnetic field compact; pressure-sintering the magnetic field compact to obtain a sintered compact; and heat treating the sintered compact.

Provided are a composite material having direct current superposition characteristics, low iron loss, and high strength, a magnetic core for a magnetic component and a reactor, the magnetic core and the reactor including the composite material, a converter including the reactor, and a power conversion device including the converter. A composite material includes a soft magnetic powder, a filler, and a resin portion enclosing the soft magnetic powder and the filler dispersed therein, wherein the filler has rubber and an outer circumferential layer that covers a surface of the rubber and that contains an organic substance, and the resin portion contains a thermoplastic resin.

Included is a method of preparing a compound for bonded magnets, the method including: coating a magnetic material having an average particle size of 10 μm or less with a thermosetting resin and a curing agent at a ratio of the equivalent weight of the curing agent to the equivalent weight of the thermosetting resin of 2 or higher and 10 or lower to obtain a coated material; granulating the coated material by compression to obtain a granulated product; milling the granulated product to obtain a milled product; and surface treating the milled product with a silane coupling agent to obtain a compound for bonded magnets, the method either including, between the granulation and the milling, heat curing the granulated product to obtain a cured product, or including, between the milling and the surface treatment, heat curing the milled product to obtain a cured product.

An L10-FeNi magnetic powder has an average particle size of 50 nm to 1 μm, and an average value of sphericity P of 0.9 or more. The sphericity P is defined as P=Ls/Lr, where Lr is a perimeter of an L10-FeNi magnetic powder particle on an image of a microscope, and Ls is a perimeter of a perfect circle that has a same area as the L10-FeNi magnetic powder particle on the image for which Lr is calculated.

A permanent magnet includes R and T (R essentially includes Sm one or more of rare earth elements in addition to Sm, and T essentially includes Fe, or Fe and Co, one or more of transition metal elements in addition to Fe, or Fe and Co). A composition ratio of R in the permanent magnet is 20 at % or more and 40 at % or less. A remaining part is substantially only T, or only T and C. T amount is more than 1.5 times of R amount and less than 4.0 times of the R amount. Main phase grains included in the permanent magnet have an Nd5Fe17 type crystal structure. An average crystal grain size of the main phase grains of the permanent magnet is greater than 1 μm. A number ratio of main phase grains having a crystal grain size of less than 0.4 μm is less than 20%.

An anisotropic bonded magnet and a preparation method thereof are provided. By stacking magnets having different magnetic properties and/or densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in pressing densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method solves the problem of “low in the middle and high at two ends” caused by the phenomenon of non-uniform magnetic field orientation and density along a height direction during orientation and densification.

A responsive material having an elastomeric matrix in which ferromagnetic particles are dispersed so as to have a predetermined magnetization pattern which, when exposed to an external magnetic field, changes the shape of the responsive material from an initial shape to a predetermined transformed shape dictated by the magnetization pattern. An initial shape of the responsive material is formed by direct ink printing while applying magnetic fields to a dispensing nozzle to align the particles and gives rise to the desired magnetization pattern.

An electric machine that is configured to propel a vehicle includes a stator and a rotor. The stator has windings that are configured to generate magnetic fields. The rotor has a plurality of magnetic blocks that interacts with the magnetic fields to produce rotational motion. Each of the plurality of magnetic blocks is segmented into a plurality of permanent magnets. Adjacent permanent magnets within each magnetic block are separated from and secured to each other via an intermediate electrically insulating material. The intermediate electrically insulating material is comprised of magnetic particles that are suspended in an adhesive matrix.