Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers
TD Skinner, M Wang, AT Hindmarch… - Applied Physics …, 2014 - pubs.aip.org
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 1 nm, the sign
of the sum of the field-like torque and Oersted torque reversed. This observation is …
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 1 nm, the sign
of the sum of the field-like torque and Oersted torque reversed. This observation is …