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

Baldrati, L.*; Schmitt, C.*; Gomonay, O.*; Lebrun, R.*; Ramos, R.*; Saito, Eiji; Sinova, J.*; Klui, M.*

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 $4times10^{-11}$ TA $^{-1}$ m. The Nel vector final state is in line with a thermomagnetoelastic switching mechanism for a negative magnetoelastic constant of the CoO.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	125
Number	:	7
Pages	:	p.077201_1 - 077201_6
Publication Year/Month	:	2020/08
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.125.077201
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Keywords	:	反強磁性体; スピン軌道トルク; スピンホール磁気抵抗効果
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Registration No. : AA20220571
JAEA Abstracts No. : 50001193
Paper Submission No. : 25960

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