Magnetization reorientation induced by spin–orbit torque in YIG/Pt bilayers*

Abstract

In this work, we report the reorientation of magnetization by spin–orbit torque (SOT) in YIG/Pt bilayers. The SOT is investigated by measuring the spin Hall magnetoresistance (SMR), which is highly sensitive to the direction of magnetic moment of YIG. An external in-plane rotating magnetic field which is applied to the YIG/Pt bilayers, and the evolutions of SMR under different injected currents in the Pt layer, result in deviation of SMR curve from the standard shape. We conclude that the SOT caused by spin accumulation near the interface between YIG and Pt can effectively reorient the in-plane magnetic moment of YIG. This discovery provides an effective way to modulate YIG magnetic moments by electrical methods.

Enhanced spin-orbit torque efficiency in Pt100–x Ni x alloy based magnetic bilayer*

“…In general, the HMs are chosen from 5d elements, such as Ta, W, and Pt. [1][2][3][4][5][6][7][9][10][11][12][13][14][15][16][17][18][19][20][21] When passing an electrical current in the HM/FM, it generates an out-of-plane spin current due to spin Hall effect and/or Rashba effect. The spin current diffuses into the adjacent FM layer and exerts torques, i.e., the SOTs, acting on the magnetization of FM.…”