Nanoheterostructured permanent magnet and method for producing the same
AssigneeKabushiki Kaisha Toyota Chuo Kenkyusho
InventorsHiroaki Wakayama, Hirotaka Yonekura, Yasuaki Kawai
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Abstract
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.
Claims14
A nanoheterostructured permanent magnet comprising 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 nanoheterostructured permanent magnet, comprising:
- a first step of preparing a raw material solution by dissolving, in a solvent,
- a block copolymer comprising at least a first polymer block component and a second polymer block component which are immiscible but linked to each other,
- a first inorganic precursor which is one of a hard magnetic material precursor and a soft magnetic material precursor, and
- a second inorganic precursor which is the other of the hard magnetic material precursor and the soft magnetic material precursor;
- and
- a second step including
- a phase-separation treatment for forming a nanophase-separated structure in which at least a first polymer phase comprising the first polymer block component with the first inorganic precursor introduced thereinto and a second polymer phase comprising the second polymer block component with the second inorganic precursor introduced thereinto are regularly arranged by self-assembly,
- a conversion treatment for converting the hard magnetic material precursor and the soft magnetic material precursor to a hard magnetic material and a soft magnetic material, respectively, and
- a removal treatment for removing the block copolymer from the nanophase-separated structure, to thereby obtain a nanoheterostructured permanent magnet comprising the hard magnetic material and the soft magnetic material.
Dependencies are inferred from the claim text.