A nanoheterostructured permanent magnet includes a hard magnetic material and a soft magnetic material of which one inorganic component is a matrix, and of which the other inorganic component is three-dimensionally and periodically arranged in the matrix, in a shape selected from the group consisting of a spherical shape, a columnar shape, and a gyroid shape, the nanoheterostructured permanent magnet having a three-dimensional periodic structure whose average value of one unit length of a repeated structure is 1 nm to 100 nm.

A method for producing a bonded rare-earth magnet according to an embodiment of the present invention includes the steps of: providing a rapidly solidified rare-earth magnet alloy powder; providing a solution in which a resin that is in solid phase at an ordinary temperature is dissolved in an organic solvent; mulling the rapidly solidified rare-earth magnet alloy powder and the solution together and vaporizing the organic solvent, thereby making a bonded rare-earth magnet compound in which magnet powder particles that form the rapidly solidified rare-earth magnet alloy powder are coated with the resin; making a compressed compact by compressing the bonded rare-earth magnet compound under a pressure of 1000 MPa to 2500 MPa; and thermally treating the compressed compact. If the rapidly solidified rare-earth magnet alloy powder to be mulled is 100 mass %, the solution includes 0.4 mass % to 1.0 mass % of the resin and 1.2 mass % to 20 mass % of the organic solvent.

A SmFeN-based magnetic material in which the use amount of Sm is further reduced while enhancing the saturation magnetization, and a production method thereof, are provided. The present disclosure discloses a SmFeN-based magnetic material including a main phase having a crystal structure of at least either Th.sub.2Zn.sub.17 type or Th.sub.2Ni.sub.17 type, wherein the main phase is represented by the molar ratio formula (Sm.sub.(1-x-y-z)La.sub.xCe.sub.yR.sup.1.sub.z).sub.2(Fe.sub.(1-p-q-s)Co.sub.pNi.sub.qM.sub.s).sub.17N.sub.h, where R.sup.1 is one or more rare earth elements other than Sm, La and Ce, and Zr, and M is one or more elements other than Fe, Co, Ni and rare earth elements, and an unavoidable impurity element, and 0.09x0.31, 0.24y0.60, 0.51x+y0.75, 0z0.10, 0p+q0.10, 0s0.10, and 2.9h3.1 are satisfied, and a production method thereof.

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 m 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.

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 m 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.

The present invention provides a method for making anisotropic or isotropic MnBi bonded bulk permanent magnet wherein starting high purity -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 H.sub.c close to that of the starting MnBi powder, and protecting the powder from oxidation.

The present invention provides a method for making anisotropic or isotropic MnBi bonded bulk permanent magnet wherein starting high purity -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 H.sub.c close to that of the starting MnBi powder, and protecting the powder from oxidation.