Permanent magnet and rotating machine including the same

Patent metadata

Field	Value
Publication number	US-10170225-B2
Application number	US-201615135337-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Apr 21, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A permanent magnet having a periodic structure with the concentrations of Fe and T (T is one or more transition metal elements with Co or Ni as necessity) changing alternately, wherein, the concentrations change with a period of 3.3 nm or less and the concentration difference of Fe in the concentration change is 5 at % or more. The permanent magnet has a high saturation magnetization Is and coercivity HcJ and can be prepared even without rare earth element(s) R.

First claim

What is claimed is:

1. A permanent magnet comprising a periodic structure in which concentrations of Fe and T change alternately,
wherein T is at least one of Co or Ni, optionally with one or more additional transition metal elements,
the concentrations change with a period of 3.3 nm or less, and
a concentration difference of Fe in the concentration change is 5 at % or more.

2. The permanent magnet according to claim 1 , wherein
an average composition of the periodic structure is Fe 1-x T x (0.15≤x≤0.8).

3. A rotating machine comprising the permanent magnet according to claim 1 .

4. A rotating machine comprising the permanent magnet according to claim 2 .

Assignees

• Tdk Corp

Inventors

• Suzuki Kenichi
• Kadota Shogo
• Fukuchi Eiichiro

Classifications

• H01F41/18

  by cathode sputtering · CPC title

• H01F1/047

  Alloys characterised by their composition · CPC title

• H01F10/16

  containing cobalt ({H01F10/126} , H01F10/13 take precedence) · CPC title

• H01F1/055 Primary

  and magnetic transition metals, e.g. SmCo5 · CPC title

• C22C38/10

  containing cobalt · CPC title