论文标题
$α$ -fe $ _2 $ o $ $ _3 $外司上胶片的反铁磁性néel订单的电气切换的直接成像
Direct Imaging of Electrical Switching of Antiferromagnetic Néel Order in $α$-Fe$_2$O$_3$ Epitaxial Films
论文作者
论文摘要
我们报告了响应于微米级PT/$α$ -FE $ _2 $ _2 $ _3 $ hall bars bars使用光疗法电子显微镜使用的，对抗铁磁（AFM）域的Néel载体的转换的直接观察。当前的脉冲导致可逆和可重复的切换，而当前方向决定了最终状态，这与Hall效应实验仅探测空间平均响应。当前的脉冲还会在当前路径内甚至之外产生域结构的不可逆变化。在这两种情况下，仅响应脉冲的域切换的一部分。此外，对使用不同X射线极化拍摄的图像的分析表明，AFMnéel顺序具有平衡中的平面成分，这对于分析切换数据很重要。这些结果表明，在与PT层的自旋轨道扭矩相关的效果外，可以通过纯热效应引起可逆的开关变化。
We report the direct observation of switching of the Néel vector of antiferromagnetic (AFM) domains in response to electrical pulses in micron-scale Pt/$α$-Fe$_2$O$_3$ Hall bars using photoemission electron microscopy. Current pulses lead to reversible and repeatable switching, with the current direction determining the final state, consistent with Hall effect experiments that probe only the spatially averaged response. Current pulses also produce irreversible changes in domain structure, in and even outside the current path. In both cases only a fraction of the domains switch in response to pulses. Further, analysis of images taken with different x-ray polarizations shows that the AFM Néel order has an out-of-plane component in equilibrium that is important to consider in analyzing the switching data. These results show that -in addition to effects associated with spin-orbit torques from the Pt layer, which can produce reversible switching-changes in AFM order can be induced by purely thermal effects.
