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US 2011/0254646 A1Published application
High resistance magnet and motor using the same
AssigneeHitachi, Ltd.
InventorsMatahiro KOMURO, Yuichi Satsu, Takao Imagawa
Life of this patent
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Abstract
A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.
Claims8
A magnet comprising ferromagnetic material grains, and a fluorine compound layer and/or an oxy-fluorine compound layer,
- wherein a main component of the ferromagnetic material grains is iron, and wherein the fluorine compound layer and/or the oxy-fluorine compound layer comprises particles having a particle size of 1 to 100 nm, and
- the fluorine compound layer and/or the oxy-fluorine compound layer respectively comprising fluoride and/or oxy-fluoride compound particles of at least one selected from the group consisting of alkali metals, alkaline earth metals and rare earth metals, and iron atoms present on and in contact with surfaces of the ferromagnetic material grains,
- wherein an amount of the iron atoms in the fluoride and/or oxy-fluoride compound is 10 ppm to 50 atomic %.
Dependencies are inferred from the claim text.