Murata Manufacturing Co., Ltd.

National Institute of Advanced Industrial Science and Technology

Takaaki Yokoyama

Wataru Yamaguchi

Kenta Takagi

Kenji Sakaguchi

Yuji Yokoyama

Kazuhiro Yoshii

Yosuke Sato

Ryoichi Yamagata

A Sm—Fe—N-based magnet powder that includes a Sm—Fe—N-based magnetic material powder, wherein an average particle size of the Sm—Fe—N-based magnetic material powder is not larger than 5 μm, and a full width at half maximum of a diffraction peak of a (220) plane in an X-ray diffraction profile of the Sm—Fe—N-based magnetic material powder is not larger than 0.0033 Å. Also disclosed is a Sm—Fe—N-based sintered magnet that includes a sintered body of a Sm—Fe—N-based magnetic material, wherein an average grain size of crystal grains of the Sm—Fe—N-based magnetic material is not larger than 5 μm, and a full width at half maximum of a diffraction peak of a (220) plane in an X-ray diffraction profile of the Sm—Fe—N-based magnetic material is not larger than 0.0033 Å.

Sm—Fe—N-based magnet powder, Sm—Fe—N-based sintered magnet, and production method therefor

A sintered magnet contains Sm&#x2014;Fe&#x2014;N-based crystal grains and has high coercivity; and a magnetic powder is capable of forming a sintered magnet without lowering the coercivity even if heat is generated in association with the sintering. A sintered magnet comprises a crystal phase composed of a plurality of Sm&#x2014;Fe&#x2014;N-based crystal grains and a nonmagnetic metal phase present between the Sm&#x2014;Fe&#x2014;N crystal grains adjacent to each other, wherein a ratio of Fe peak intensity Ito SmFeN peak intensity Imeasured by an X-ray diffraction method is 0.2 or less. A magnetic powder comprises Sm&#x2014;Fe&#x2014;N-based crystal particles and a nonmagnetic metal layer covering surfaces of the Sm&#x2014;Fe&#x2014;N crystal particles.

Magnetic powder containing Sm&#x2014;Fe&#x2014;N-based crystal particles, sintered magnet produced from same, method for producing said magnetic powder, and method for producing said sintered magnet

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Nagaokakyo, Japan

Takaaki Yokoyama