通过比较场致和电流诱导开关对反铁磁CoO/Pt中的高效自旋扭矩进行量化
Efficient Spin Torques in Antiferromagnetic CoO/Pt Quantified by Comparing Field- and Current-Induced Switching.
作者信息
Baldrati L, Schmitt C, Gomonay O, Lebrun R, Ramos R, Saitoh E, Sinova J, Kläui M
机构信息
Institute of Physics, Johannes Gutenberg-University Mainz, 55128 Mainz, Germany.
Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau 91767, France.
出版信息
Phys Rev Lett. 2020 Aug 14;125(7):077201. doi: 10.1103/PhysRevLett.125.077201.
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 4×10^{-11} T A^{-1} m^{2}. The Néel vector final state (n⊥j) is in line with a thermomagnetoelastic switching mechanism for a negative magnetoelastic constant of the CoO.
我们在具有四重面内磁各向异性的共线绝缘反铁磁体CoO/Pt中实现了电流诱导开关。这通过自旋霍尔磁电阻进行电学测量，并通过CoO层的磁场诱导自旋翻转转变得到证实。通过施加电流脉冲和磁场，我们量化了起作用的电流诱导转矩的效率，并估计出电流 - 场等效比为4×10⁻¹¹ T A⁻¹ m²。奈尔矢量最终状态（n⊥j）与CoO负磁弹性常数的热磁弹性开关机制一致。
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