论文标题
旋转Seebeck效果附近的抗铁磁旋转触发器过渡
Spin Seebeck Effect near the Antiferromagnetic Spin-Flop Transition
论文作者
论文摘要
我们开发了易于轴抗铁磁体中的界面自旋seebeck效应（SSE）的低温，长波长理论。 Néel顺序的场诱导的自旋流动（SF）过渡与SSE行为的定性变化有关：在SF下方，有两个带有相反磁矩的自旋载体，沿载体沿田间形成多数磁杆。在SF上方，低能，铁磁样模式的磁矩与田地相对。这会导致SSE跨SF的符号变化，这与Cr $ _2 $ o $ $ _3 $/pt和Cr $ _2 $ o $ _3 $ _3 $ _3 $/ta设备[li $ \ textit {et et al。在我们的理论中，SSE是由于SF以下的Néel自旋电流以及SF上方的磁性自旋电流引起的。使用相关的Néel与磁性自旋电导的比率作为单个恒定拟合参数，我们重现了实验数据的场依赖性，并部分地跨SSE跨SF的温度依赖性。
We develop a low-temperature, long-wavelength theory for the interfacial spin Seebeck effect (SSE) in easy-axis antiferromagnets. The field-induced spin-flop (SF) transition of Néel order is associated with a qualitative change in SSE behavior: Below SF, there are two spin carriers with opposite magnetic moments, with the carriers polarized along the field forming a majority magnon band. Above SF, the low-energy, ferromagnetic-like mode has magnetic moment opposite the field. This results in a sign change of the SSE across SF, which agrees with recent measurements on Cr$_2$O$_3$/Pt and Cr$_2$O$_3$/Ta devices [Li $\textit{et al.,}$ $\textit{Nature}$ $\textbf{578,}$ 70 (2020)]. In our theory, SSE is due to a Néel spin current below SF and a magnetic spin current above SF. Using the ratio of the associated Néel to magnetic spin-mixing conductances as a single constant fitting parameter, we reproduce the field dependence of the experimental data and partially the temperature dependence of the relative SSE jump across SF.
