论文标题
界面引起的类似场的光学自旋扭矩/重金属异质结构
Interface-induced field-like optical spin torque in a ferromagnet/heavy metal heterostructure
论文作者
论文摘要
使用光螺旋性在金属铁磁铁中对磁化的操纵引起了人们对未来的光旋转设备的关注。最近在铁磁性薄膜中观察到了磁化强度{\ IT光旋转扭矩}的光螺旋感诱导的扭矩。然而，到目前为止，尚未解决铁磁/非磁性重金属异质结构中光旋转扭矩的界面效应，该结构尚未得到解决，该结构被广泛用于通过电气手段有效控制磁化。在这里，我们研究了铁磁/非磁性重金属异质结构中的光旋转扭矩矢量，并观察到，随着铁磁层的减小，平面场状光学自旋扭矩显着增加。界面样光旋转扭矩是由光学rashba-edelstein效应由结构反转对称性破裂引起的。这项工作将有助于使用光螺旋性进行有效的薄膜纳米磁体的光学操纵。
The manipulation of magnetization in a metallic ferromagnet by using optical helicity has been much attracted attention for future opto-spintronic devices. The optical helicity induced torques on the magnetization, {\it optical spin torque}, have been observed in ferromagnetic thin films recently. However, the interfacial effect of the optical spin torque in ferromagnet/nonmagnetic heavy metal heterostructures have not been addressed so far, which are widely utilized to efficiently control magnetization via electrical means. Here, we studied optical spin torque vectors in the ferromagnet/nonmagnetic heavy metal heterostructures and observed that in-plane field-like optical spin torque was significantly increased with decreasing ferromagnetic layer thicknesses. The interfacial field-like optical spin torque was explained by the optical Rashba-Edelstein effect caused by the structural inversion symmetry breaking. This work will aid in the efficient optical manipulation of thin film nanomagnets using optical helicity.
