论文标题
与温度依赖性的临界自旋轨道场，用于抗铁磁铁的正交切换
Temperature-dependent critical spin-orbit field for orthogonal switching in antiferromagnets
论文作者
论文摘要
发现电流引起的旋转轨道扭矩（SOT）正交重定向，也称为正交开关，金属Mn $ _2 $ au，Cumnas为超快写作抗Fiferromagagnet（AFM）打开了大门。现象学理论预测，超时脉冲的SOT切换所需的最小场（临界场）与脉搏持续时间成反比，从而限制了使用超快刺激作为切换的驱动力。我们探讨了通过改变工作温度的可能性，临界场会减少对超短脉冲的正交切换的可能性。为此，我们将先前的理论扩展到有限的温度，并表明正交切换的临界场很大程度上取决于温度。我们确定临界场的温度依赖性如何随脉冲持续时间的函数而变化。而对于长脉冲，临界场的温度依赖性由各向异性场确定，对于超短脉冲，它取决于AFM的特征频率。我们表明，临界场的短脉冲持续时间限制可以通过分析表达来连接。
The discovery of current-induced spin-orbit torque (SOT) orthogonal reorientation, also known as orthogonal switching, of metallic Mn$_2$Au and CuMnAs has opened the door for ultrafast writing of an antiferromagnet (AFM). Phenomenological theory predicts that the minimum field necessary for SOT switching -- critical field -- for ultrashort pulses increases inversely proportional to the pulse duration, thereby limiting the use of ultrafast stimulus as driving force for switching. We explore the possibility that by varying the working temperature the critical field reduces enabling orthogonal switching in response to ultrashort pulses. To do so, we extend previous theory to finite temperature and show that the critical field for an orthogonal switching strongly depends on temperature. We determine how the temperature dependence of the critical field varies as a function of the pulse duration. While for long pulses, the temperature dependence of the critical field is determined by the anisotropy field, for ultrashort pulses, it is determined by the characteristic frequency of the AFM. We show that the short and long pulse duration limits for the critical field can be connected by an analytical expression.
