The present invention relates to a coil (1) for an inductor (6), comprised by metal wire (2) wound circular around a centre axis (C), wherein the wire has an electrically insulating layer (3) insulating each turn of the wire in the winding from neighbouring turns, the shape of the complete winding, building up the coil (1), is substantially toroidal having a substantially elliptic cross section, wherein the thermal heat conductivity is above 1 W/m*K more preferably above 1.2 and most preferably above 1.5. The invention further relates to a magnetic core (7) suitable for an inductor (6), where in the core is made of a soft magnetic composite material made of metallic particles and a binder material, said particles are in the range of 1 m-1000 m, particles that are larger than 150 m are coated with a ceramic surface to provide particle to particle electrical insulation, wherein the volume of magnetic, metallic particles to total core volume is 0.5-0.9. The invention still further relates to an inductor (6) being a combination of said coil (1) and core (7), wherein the substantially all of said particles in the core are magnetically aligned with the magnetic field of the coil. The invention still further relates to the manufacturing methods of such a coil (1) and core (7).

A coil may include a metal wire wound circular around a center axis. The wire may have an electrically insulating layer insulating each turn of the wire in the winding from neighbouring turns. The shape of the complete winding, building up the coil, may be toroidal having an elliptic cross section in a plane perpendicular to a wire winding direction. And the wound coil may have a metal volume to total volume at a level so that the thermal heat conduction of the coil is above 0.8 W/m*K. A method for producing such a coil may involve applying the insulating layer to the wire. The wire may be wound around the center axis. The winding may be compressed to a toroidal shape.

Ferromagnetic nanoparticles which are converted from paramagnetic, antiferromagnetic, ferrimagnetic or weak ferromagnetic nanoparticles by incorporation of a dopant, the dopant having a concentration less than 0.5%. Major changes occur in the magnetic properties of the host material. A weak paramagnetic material such as Mn.sub.3O.sub.4 is been converted to a ferromagnetic material that has a Curie point beyond 700 C. and shows almost temperature independent coercivity and magnetic moment. These ferromagnetic nanoparticles can be used as contrast agent, as a vehicle for targeted drug delivery, high temperature magnets, high density magnets, magnetic circuits and many more devices utilizing local interaction of the magnetic field.

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 m 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 molding device for molding a magnet roll with a profiled cross-section comprises a heating and kneading unit that supplies, to a cylindrical metal mold, a kneaded material obtained by heating and kneading a raw mixture including ferromagnetic particles and thermoplastic resin, an extrusion molding unit that molds the supplied kneaded material by the metal mold, and a magnetic field generating unit disposed at an end portion of the metal mold in a lengthwise direction that generates a magnetic field inside the metal mold, and the metal mold has a profiled C-shaped cross-section at an inlet for the kneaded material and a profiled cross-section at an outlet for the kneaded material more complex than the inlet.

Disclosed are an MnBi sintered magnet exhibiting excellent thermal stability as well as excellent magnetic characteristics at high temperature, an MnBi anisotropic complex sintered magnet, and a method of preparing the same.

Magnetic fiber structures include a fiber and a plurality of permanent magnet particles carried by the fiber.

Techniques disclosed here provide an array of magnets and a method of manufacturing a magnet array. In an embodiment, the array of magnets includes a plurality of three-pole magnets arranged in an array in which each three-pole magnet comprising the array is adjacent to one or more other three-pole magnets comprising the array. For example, a three-pole magnet comprises a first surface comprising a first magnetic pole having a first magnetic polarity, a second surface that is adjacent to and at least partly orthogonal to the first surface and which comprises a second magnetic pole having a second magnetic polarity that is opposite the first magnetic polarity, and a third surface that is adjacent to the first surface at an end substantially opposite the second surface and which comprises a third magnetic pole having the second magnetic polarity.

The rare-earth sintered magnet has a configuration in which a large number of magnet material particles including a rare-earth substance and each having an axis of easy magnetization have been integrally sintered. The rare-earth sintered magnet is provided with a first surface and a second surface opposing each other in the thickness direction. In a plane in parallel with a width direction and the thickness direction, the magnet material particles are magnetized such that, in a region extending from each of both end portions in the width direction toward the center portion in the width direction, the orientation direction of the easy magnetization axis is gradually changed. A maximum surface magnetic flux density in the first surface and a maximum surface magnetic flux density in the second surface satisfy the relationship (D1/D2)4.

A method of forming a permanent magnet includes processing a mixture of mischmetal-FeB particles having an average MM.sub.2Fe.sub.14B grain size below 500 nm and low melting point (LMP) alloy particles into a compact defining grain boundaries between MM.sub.2Fe.sub.14B grains; hot-pressing the compact; and hot-deforming the compact to diffuse the LMP alloy particles into the grain boundaries, thickening the grain boundaries and modifying a surface region composition of the MM2Fe14B grains.