希薄磁性半導体Zn_<1-x>Cr_xTeの強磁性特性(磁性体物理)

概要

論文の詳細を見る
II-VI diluted magnetic semiconductor (DMS) Zn_<1-x>Cr_xTe films with Cr concentrations up of to x = 0.20 were successfully grown. A single-phase Zn_<1-x>Cr_xTe layer was obtained in films grown at relatively low temperatures of around 250℃. Magnetic circular dichroism measurements showed strong mixing between sp-carriers and localized d-spins, indicating that Zn_<1-x>Cr_xTe are DMS. For x = 0.20, spontaneous magnetization was confirmed by the Arrott plots. The Curie temperature of x = 0.20 was estimated to be 300 K ± 10K, which is the highest value among the DMSs in which sp-d exchange interaction has been confirmed. In spite of its high Curie temperature, Zn_<1-x>Cr_xTe showed a semiconducting electrical transport property. The co-existence of room-temperature ferromagnetism and semiconducting characters will make Zn_<1-x>Cr_xTe a promising material for various spintronic applications.
社団法人日本磁気学会の論文
2003-04-01