Rare earth permanent magnet - Kidorui Cobalt Magnet

Japanese: 希土類コバルト磁石 - きどるいコバルトじしゃく（英語表記）rare earth permanent magnet

A rare earth element, especially a compound of samarium (Sm) and cobalt (Co), it is an extremely excellent permanent magnet. Permanent magnet materials, such as alloy steel magnets and ferrite magnets from KS steel, MK steel, to alnico magnets, were developed and put to practical use from the beginning to the middle of the 20th century, but in the 1960s, it was discovered that some intermetallic compounds of rare earth elements and cobalt have extremely large magnetic crystal anisotropy, and research and development of this type of magnet is now actively progressing. Particularly important is the compound with samarium _{, SmCo5} , which has a maximum energy product, an indicator of permanent magnet performance, that is extremely large compared to conventional magnets.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

希土類元素，とくにサマリウムSmとコバルトCoの化合物で，きわめて優れた永久磁石。永久磁石材料にはKS鋼，MK鋼からアルニコ系磁石に至る合金鋼磁石とフェライト磁石が20世紀の初めから中ごろまでに開発され実用化されているが，1960年代に希土類元素とコバルトの金属間化合物のいくつかがきわめて大きい結晶磁気異方性をもつことが発見され，この系統の磁石の研究･開発が活発に進められている。とくに重要なものはサマリウムとの化合物SmCo₅で，永久磁石の性能の目安となる最大エネルギー積が従来の磁石に比べてきわめて大きい。

出典　株式会社平凡社世界大百科事典第２版について　情報

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