[14p-A501-1~12] 【CS.7】 10.1 新物質・新機能創生（作成・評価技術）、10.2 スピン基盤技術・萌芽的デバイス技術、10.3 スピンデバイス・磁気メモリ・ストレージ技術、10.4 半導体スピントロニクス・超伝導・強相関のコードシェアセッション

▲ [14p-A501-10] Spin-orbit torque in sputtered Bi_1-xTe_x/CoFeB bilayers

〇Zhendong Chi^1,2、Yong-Chang Lau^2,1、Masamitsu Hayashi^1,2 (1.The Univ. of Tokyo、2.NIMS)

キーワード：spin-orbit torque, bismuth alloy

In this work, we systematically studied the SOT of sputtered Bi1-xTex/CoFeB bilayers with different Te concentration x under different temperature by using the second harmonic Hall resistance technique. Bi phase dominates in light Te-doped sample according to x-ray diffraction spectra results and Te works for electron doping. The spin Hall efficiency of a Bi0.89Te0.11 sample increases as a factor of two from 10 K to 300 K. The strength of spin Hall conductance in Bi1-xTex decreases rapidly and monotonically by increasing the Te concentration x. The details of the results will be discussed in the presentation.