Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers
- Publisher: American Institute of Physics
Condensed Matter - Mesoscale and Nanoscale Physics
arxiv: Condensed Matter::Materials Science | Astrophysics::Earth and Planetary Astrophysics | Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
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 consistent with the emergence of a Rashba spin orbit torque in ultra-thin bilayers.