Ferrite sintered magnet

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United States of America Patent

PATENT NO 11380466
APP PUB NO 20190304643A1
SERIAL NO

16295156

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Abstract

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The present invention provides a ferrite sintered magnet comprising (1) main phase grains containing a ferrite having a hexagonal structure, (2) two-grain boundaries formed between two of the main phase grains, and (3) multi-grain boundaries surrounded by three or more of the main phase grains. The above ferrite sintered magnet comprises Ca, R, Sr, Fe and Co, with R being at least one element selected from the group consisting of rare earth elements and Bi, and comprising at least La. The number Nm of the above main phase grains and the number Ng of the above multi-grain boundaries in the cross section including the direction of the easy magnetization axis of the above ferrite sintered magnet satisfy the formula (1A):

description='In-line Formulae' end='lead'50%≤Nm/(Nm+Ng)≤65%  (1A).description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
TDK CORPORATIONTOKYO 103-6128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ikeda, Masanori Tokyo, JP 87 451
Morita, Hiroyuki Tokyo, JP 116 1035
Murakawa, Yoshitaka Tokyo, JP 32 367
Murase, Taku Tokyo, JP 35 120
Ono, Hiroyuki Tokyo, JP 117 930

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