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

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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Bibliographic Details
Main Authors: Skinner, T.D., Wang, M., Hindmarch, A.T., Rushforth, A.W., Irvine, A.C., Heiss, D., Kurebayashi, H., Ferguson, A.J.
Format: Article
Published: American Institute of Physics 2014
Online Access:https://eprints.nottingham.ac.uk/34353/
Description
Summary: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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