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

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-...

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Veröffentlicht in:Applied physics letters 2014-02, Vol.104 (6)
Hauptverfasser: Skinner, T. D., Wang, M., Hindmarch, A. T., Rushforth, A. W., Irvine, A. C., Heiss, D., Kurebayashi, H., Ferguson, A. J.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4864399