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

磁場誘起スイッチングと電流誘起スイッチングの比較により定量化された反強磁性CoO/Ptの効率的なスピントルク

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

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 TAm. The Nel vector final state is in line with a thermomagnetoelastic switching mechanism for a negative magnetoelastic constant of the CoO.