受賞記念講演
永久磁石用フェライト化合物のLa-Co置換による磁気異方性向上原理の研究
キーワード:
ferrite magnet,
La-Co co-substituted M-type ferrite,
uniaxial anisotropy,
high oxygen pressure
2022 年 69 巻 4 号 p. 149-154
詳細
2022 年 69 巻 4 号 p. 149-154
La-Co co-substituted magnetoplumbite-type ferrite is a base material used for high-performance ferrite magnets. The presence of small amount of Co2+ dramatically improves the coercivity. The unquenched angular moment of Co2+ must enhance the uniaxial anisotropy of M-type ferrite, however, the Co occupation site, i.e., the oxygen coordination, which is the key of the magnetic anisotropy, has not been revealed. We review the series of works to identify the Co substituted site in La-Co co-substituted magnetoplumbite-type ferrite.
