[14p-A501-1~12] 【CS.7】 Code-sharing Session of 10.1 & 10.2 & 10.3 & 10.4

▲ [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)

Keywords: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.