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 0003-6951
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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