Fe_2Cr_<1-x>Ti_xSiホイスラー合金の構造と磁性(スピンエレクトロニクス)

概要

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We have investigated the preparation, structures, and magnetic properties of bulk Fe_2CrSi and Fe_2Cr_<1-x>Ti_xSi Heusler alloys. Although a Cr-rich secondary phase coexists with the Heusler mother phase in stoichiometric Fe_2CrSi samples, high temperature annealing (1200℃) effectively reduces the extent of the Cr-rich secondary phase. We found that pure single-phase samples can be prepared in a narrow composition range of 22% Cr. For a Fe_2Cr_<1-x>Ti_xSi system with Ti content x of up to 1/8, virtually single-phase Heusler alloys have been obtained. The saturation magnetization of Fe_2Cr_<1-x>Ti_xSi decreased with increasing Ti content, while their Curie temperatures T_c remained constant.
2008-05-01