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:
Mar. 01, 2016
Filed:
Jul. 05, 2010
Junichi Nagaoka, Chuo-ku, JP;
Takahiro Mori, Chuo-ku, JP;
Hiroyuki Morita, Chuo-ku, JP;
Yoshihiko Minachi, Chuo-ku, JP;
Junichi Nagaoka, Chuo-ku, JP;
Takahiro Mori, Chuo-ku, JP;
Hiroyuki Morita, Chuo-ku, JP;
Yoshihiko Minachi, Chuo-ku, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
An object of the present invention is to provide a ferrite magnetic material capable of providing a permanent magnet in which high Br and HcJ are kept, and which has a high Hk/HcJ. A ferrite magnetic material in accordance with a preferred embodiment has a ferrite phase having a hexagonal structure and has a main composition represented by CaRSrBaFeMO(R is at least one element of rare earth elements (including Y) essentially including La, and Bi, and M is at least one element of Co, Mn, Mg, Ni, Cu, and Zn essentially including Co), where 0.25<w<0.65, 0.01<x<0.45, 0.0002<y<0.011, y<x, 8<z<11, 1.0<w/m<2.5, and 0.017<m/z<0.065 are satisfied. The total amount of a Si component is 0.1 to 3 mass % based on the amount of the main composition, and respective elements satisfy the relationship of 1.5≦[(Ca+R+Sr+Ba)−(Fe+M)/12]/Si≦3.5.