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arXiv · 2003.05923

Efficient spin torques in antiferromagnetic CoO/Pt quantified by comparing field- and current- induced switching

Lorenzo Baldrati·Christin Schmitt·Olena Gomonay·Romain Lebrun·Rafael Ramos·Eiji Saitoh·Jairo Sinova·Mathias Kläui
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Abstract

We achieve current-induced switching in collinear insulating antiferromagnetic CoO/Pt, with fourfold in-plane magnetic anisotropy. This is measured electrically by spin Hall magnetoresistance and confirmed by the magnetic field-induced spin-flop transition of the CoO layer. By applying current pulses and magnetic fields, we quantify the efficiency of the acting current-induced torques and estimate a current-field equivalence ratio of $4x10^{-11} T A^{-1} m^2$. The N\'eel vector final state ($n \perp j$) is in line with a thermomagnetoelastic switching mechanism for a negative magnetoelastic constant of the CoO.

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Lorenzo Baldrati, Christin Schmitt, Olena Gomonay, Romain Lebrun, Rafael Ramos, Eiji Saitoh, Jairo Sinova, Mathias Kläui. 2020-03-12. Efficient spin torques in antiferromagnetic CoO/Pt quantified by comparing field- and current- induced switching. https://doi.org/10.1103/physrevlett.125.077201

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