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:
Jul. 29, 2025
Filed:
Mar. 04, 2022
Applicant:
Tdk Corporation, Tokyo, JP;
Inventor:
Shirou Ootsuki, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/055 (2006.01); B22F 9/04 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0557 (2013.01);
Abstract
Provided is a ferrite magnet including: magnetoplumbite type ferrite crystal grains; and a grain boundary phase interposed between the ferrite crystal grains. The ferrite crystal grains and the grain boundary phase respectively contain a metal element A, La, Co, and Fe, the metal element A is at least one kind of element selected from the group consisting of Sr, Ba, and Ca, and when an atomic ratio of Co to La in the ferrite crystal grains is set as R, and an atomic ratio of Co to La in the grain boundary phase is set as R, the following expression is satisfied.0.5≤R/R≤0.9