反铁磁Mn $_2$ Au：Néel自旋轨道力矩和大的各向异性磁电阻的写入和读出
Writing and Reading antiferromagnetic Mn$_2$Au: Néel spin-orbit torques and large anisotropic magnetoresistance
摘要：
反铁磁体是磁性有序的材料，其不表现出净磁矩，因此对磁场不敏感。反铁磁自旋电子学的目的是利用这种不敏感性来增强稳定性，同时可以进行高达反铁磁体的自然THz动态速度的主动操纵，从而结合了卓越的存储密度和超快开关。然而，Néel矢量（交错矩）方向的主动操纵和读出具有挑战性。最近的预测已经开辟了一条基于新的自旋轨道力矩的道路，它直接与Néel序参量耦合。这种Néel自旋轨道力矩首先在使用半金属CuMnAs的开创性工作中实验证明。在这里，我们证明Mn $_2$金，一个良好的导体，具有高的有序温度适用于应用程序，可靠和可再现的开关，使用电流脉冲和读出的磁阻测量。的扭矩的对称性与理论预测和一个大的读出大于$\simeq 6$ ~ $\%$的磁阻效应是由从头计算输运计算再现。
英文摘要：
Antiferromagnets are magnetically ordered materials which exhibit no net moment and thus are insensitive to magnetic fields. Antiferromagnetic spintronics aims to take advantage of this insensitivity for enhanced stability, while at the same time active manipulation up to the natural THz dynamic speeds of antiferromagnets is possible, thus combining exceptional storage density and ultra-fast switching. However, the active manipulation and read-out of the Néel vector (staggered moment) orientation is challenging. Recent predictions have opened up a path based on a new spin-orbit torque, which couples directly to the Néel order parameter. This Néel spin-orbit torque was first experimentally demonstrated in a pioneering work using semimetallic CuMnAs. Here we demonstrate for Mn$_2$Au, a good conductor with a high ordering temperature suitable for applications, reliable and reproducible switching using current pulses and readout by magnetoresistance measurements. The symmetry of the torques agrees with theoretical predictions and a large read-out magnetoresistance effect of more than $\simeq 6$~$\%$ is reproduced by ab initio transport calculations.
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