Rare Earth-Transition Metal Permanent Magnets
D. Givord, Grenoble
(Laboratoire Louis Néel, C.N.R.S.I
I — From AINiCo's to Neodymium-IronBoron Permanent Magnets In several instances, since the beginning of this century, the discovery of new magnetic materials has strongly influenced the development of permanent magnets. The first very important advance was made in 1932 in Japan. Mishima prepared magnets by thermal treatment of an alloy based on iron, nickel and aluminium, that led to a new range of alloys now known as AINiCo. The energy product attained was an order of magnitude larger than that of any previously known magnetic material. In 1953, low cost ferrites were discovered in the Philips laboratories. These have the remarkable property of being strongly resistant to induction fields which tend to reverse the magnetic moment, i.e. they have a high coercivity
https://www.europhysicsnews.org/articles/epn/pdf/1987/07/epn19871807p93.pdf
(Laboratoire Louis Néel, C.N.R.S.I
I — From AINiCo's to Neodymium-IronBoron Permanent Magnets In several instances, since the beginning of this century, the discovery of new magnetic materials has strongly influenced the development of permanent magnets. The first very important advance was made in 1932 in Japan. Mishima prepared magnets by thermal treatment of an alloy based on iron, nickel and aluminium, that led to a new range of alloys now known as AINiCo. The energy product attained was an order of magnitude larger than that of any previously known magnetic material. In 1953, low cost ferrites were discovered in the Philips laboratories. These have the remarkable property of being strongly resistant to induction fields which tend to reverse the magnetic moment, i.e. they have a high coercivity
https://www.europhysicsnews.org/articles/epn/pdf/1987/07/epn19871807p93.pdf
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