The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2008
Filed:
Oct. 28, 2005
Junichi Nagaoka, Tokyo, JP;
Shigeki Yanagida, Tokyo, JP;
Kunio Ohno, Tokyo, JP;
Syunsuke Kurasawa, Tokyo, JP;
Yoshihiko Minachi, Tokyo, JP;
Junichi Nagaoka, Tokyo, JP;
Shigeki Yanagida, Tokyo, JP;
Kunio Ohno, Tokyo, JP;
Syunsuke Kurasawa, Tokyo, JP;
Yoshihiko Minachi, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention provides a ferrite magnet material comprising, as a main phase, a ferrite having a hexagonal structure, the main phase containing A, La, R, Fe and Co, wherein A is at least one element selected from Sr, Ba and Pb, R is Pr and/or Nd, and the proportions of the total metal elements A, La, R, Fe and Co in the main phase are respectively A: 1 to 13 atomic %, La: 0.003 to 10 atomic %, R: 0 to 10 atomic % (excluding 0) Fe: 80 to 95 atomic % and Co: 0.05 to 5 atomic % based on the total amounts of metal elements. The residual magnetic flux density Br and coercive force HcJ can be improved without increasing the content of Co by incorporating Pr and/or Nd along with La and Co in the ferrite magnet material.