Antidamping-Torque-Induced Switching in Biaxial Antiferromagnetic Insulators
Antidamping-Torque-Induced Switching in Biaxial Antiferromagnetic Insulators
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双轴反铁磁绝缘体中的抗阻尼扭矩感应切换
DOI：
10.1103/physrevlett.120.207204
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发表时间：
2018-05-16
影响因子：
8.6
通讯作者：
Tserkovnyak, Y.
中科院分区：
文献类型：
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作者：
Chen, X. Z.;Zarzuela, R.;Tserkovnyak, Y.
我们研究了NiO(001)/铂异质结中电流诱导的Neel有序转变，这在电学上表现为自旋霍尔磁阻。在室温下，当电流阈值在10(7)A/cm(2)范围内时，纵向和横向电阻发生了显著的可逆变化。序参数转换归因于(电流诱导的)反阻尼力矩触发的反铁磁动力学，它将Neel有序定向到写入电流的方向。这与像Mn2Au和CuMnAs这样的反铁磁体的情况形成了鲜明的对比，在这些反铁磁体中，由Edelstein效应诱导的类场扭矩驱动Neel开关，从而导致Neel顺序和写入电流之间的正交排列。我们的发现可以很容易地推广到其他双轴反铁磁体，为反铁磁自旋电子学中的全电子写入和读出提供了广阔的机会。
We investigate the current-induced switching of the Neel order in NiO(001)/Pt heterostractures, which is manifested electrically via the spin Hall magnetoresistance. Significant reversible changes in the longitudinal and transverse resistances are found at room temperature for a current threshold lying in the range of 10(7) A/cm(2). The order-parameter switching is ascribed to the antiferromagnetic dynamics triggered by the (current-induced) antidamping torque, which orients the Neel order towards the direction of the writing current. This is in stark contrast to the case of antiferromagnets such as Mn2Au and CuMnAs, where fieldlike torques induced by the Edelstein effect drive the Neel switching, therefore resulting in an orthogonal alignment between the Neel order and the writing current. Our findings can be readily generalized to other biaxial antiferromagnets, providing broad opportunities for all-electrical writing and readout in antiferromagnetic spintronics.