Rare earth magnet and method for producing same
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United States of America Patent
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Dec 4, 2012
Grant Date -
Apr 15, 2010
app pub date -
Dec 11, 2009
filing date -
Dec 28, 2005
priority date (Note) -
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Abstract
A rare-earth magnet includes a magnet body made of an R—Fe—B based rare-earth magnet material (where R is at least one rare-earth element) and a metal film that has been deposited on the surface of the magnet body. The magnet further includes a plurality of reaction layers between the magnet body and the metal film. The reaction layers include: a first reaction layer, which contacts with at least some of R2Fe14B type crystals, included in the magnet body, to have received the rare-earth element that has been included in the R2Fe14B type crystals; and a second reaction layer, which is located between the first reaction layer and the metal film and which has a lower rare-earth element concentration than that of the first reaction layer.
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