Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers
Skinner, T.D. and Wang, M. and Hindmarch, A.T. and Rushforth, A.W. and Irvine, A.C. and Heiss, D. and Kurebayashi, H. and Ferguson, A.J. (2014) Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers. Applied Physics Letters, 104 (6). 062401/1-062401/4. ISSN 1077-3118
Current-induced torques in ultrathin Co/Pt bilayers were investigated using an electrically driven ferromagnetic resonance technique. The angle dependence of the resonances, detected by a rectification effect as a voltage, was analysed to determine the symmetries and relative magnitudes of the spin-orbit torques. Both anti-damping (Slonczewski) and field-like torques were observed. As the ferromagnet thickness was reduced from 3 to 1nm, the sign of the sum of the field-like torque and Oersted torque reversed. This observation is consistent with the emergence of a Rashba spin orbit torque in ultra-thin bilayers.
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