Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers

Article, Preprint English OPEN
Skinner, T.D. ; Wang, M. ; Hindmarch, A.T. ; Rushforth, A.W. ; Irvine, A.C. ; Heiss, D. ; Kurebayashi, H. ; Ferguson, A.J. (2014)
  • Publisher: American Institute of Physics
  • Related identifiers: doi: 10.1063/1.4864399
  • Subject: 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.
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