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A half-metal is any substance that acts as a conductor to electrons of one spin orientation, but as an insulator or semiconductor to those of the opposite orientation. Although all half-metals are ferromagnetic (or ferrimagnetic), most ferromagnets are not half-metals. Many of the known examples of half-metals are oxides, sulfides, or Heusler alloys. In half-metals, the valence band for one spin orientation is partially filled while there is a gap in the density of states for the other spin orientation. This results in conducting behavior for only electrons in the first spin orientation. In some half-metals, the majority spin channel is the conducting one while in others the minority channel is. Some notable half-metals are chromium(IV) oxide, magnetite, and lanthanum strontium manganite (LSMO),〔 as well as chromium arsenide. Half-metals have attracted some interest for their potential use in spintronics. ==References== * Son, Y.W.; Cohen, M.L.; Louie, S.G. (2006). Half-metallic graphene nanoribbons ''Nature'' 444: 347-349. * http://www-users.york.ac.uk/~ah566/research/half_metals.html * http://www.tcd.ie/Physics/People/Michael.Coey/oxsen/newsletter/january98/halfmeta.htm 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Half-metal」の詳細全文を読む スポンサード リンク
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