Electrically controlled switching in an antiferromagnet (AFM), utilizing a currentless mechanism, is theoretically examined at finite temperatures. The structure consists of a metallic AFM with biaxial magnetic anisotropy sandwiched between a ferromagnetic spin filter and a semiconductor Schottky junction in a two-terminal pillar configuration. The calculations show that the torque necessary for the desired ${90}^{\circ }$ rotation of the Néel vector between two easy axes can be provided efficiently by pumping spin-polarized electrons into and out of the AFM through the metallic ferromagnetic layer. Consideration of thermal fluctuations illustrates the stochastic nature of the switching, whose probability distribution can be tailored by the electrical signal pulse as well as by the device dimensions. Detection of the Néel-vector state following this rotation may also be achieved straightforwardly via the large anisotropic magnetoresistance of the biaxial antiferromagnetic material. These properties, along with an ultrafast switching speed and a low energy requirement, are expected to be well suited for applications in nonvolatile memory and probabilistic computing.

中文翻译：

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反铁磁结构中通过自旋泵抽运进行随机切换的有效控制

理论上，在有限的温度下，研究了利用无电流机制的反铁磁体（AFM）中的电控开关。该结构由具有双轴磁各向异性的金属原子力显微镜（AFM）夹在铁磁自旋滤波器和半导体肖特基结之间，并呈两端柱状配置。计算结果表明，所需扭矩${90}^{\circ }$通过将自旋极化电子通过金属铁磁层泵入和流出AFM，可以有效地提供Néel向量在两个易轴之间的旋转。热波动的考虑说明了开关的随机特性，其概率分布可以通过电信号脉冲以及器件尺寸来调整。也可以通过双轴反铁磁材料的大各向异性磁阻来直接实现旋转之后的Néel矢量状态的检测。这些特性以及超快的切换速度和低能耗要求，预计将非常适合非易失性存储器和概率计算中的应用。