Wang Hongru, Meng Jing, Lin Jianjun, Xu Bin, Ma Hai, Kan Yucheng, Chen Rui, Huang Lujun, Chen Ye, Yue Fangyu, Duan Chun-Gang, Chu Junhao, Sun Lin
Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai, China.
The Extreme Optoelectromechamics Laboratory (XXL), School of Physics and Electronic Science, East China Normal University, Shanghai, China.
Nat Commun. 2024 May 22;15(1):4362. doi: 10.1038/s41467-024-48710-6.
Light-induced spin currents with the faster response is essential for the more efficient information transmission and processing. Herein, we systematically explore the effect of light illumination energy and direction on the light-induced spin currents in the W/YFeO heterojunction. Light-induced spin currents can be clearly categorized into two types. One is excited by the low light intensity, which mainly involves the photo-generated spin current from spin photovoltaic effect. The other is caused by the high light intensity, which is the light-thermally induced spin current and mainly excited by spin Seebeck effect. Under low light-intensity illumination, light-thermally induced temperature gradient is very small so that spin Seebeck effect can be neglected. Furthermore, the mechanism on spin photovoltaic effect is fully elucidated, where the photo-generated spin current in YFeO mainly originates from the process of spin precession induced by photons. These findings provide some deep insights into the origin of light-induced spin current.
具有更快响应速度的光诱导自旋电流对于更高效的信息传输和处理至关重要。在此，我们系统地研究了光照能量和方向对W/YFeO异质结中光诱导自旋电流的影响。光诱导自旋电流可清晰地分为两类。一类是由低光强度激发的，主要涉及自旋光伏效应产生的光生自旋电流。另一类是由高光强度引起的，即光热诱导自旋电流，主要由自旋塞贝克效应激发。在低光强度光照下，光热诱导的温度梯度非常小，以至于自旋塞贝克效应可以忽略不计。此外，自旋光伏效应的机制得到了充分阐明，其中YFeO中的光生自旋电流主要源于光子诱导的自旋进动过程。这些发现为光诱导自旋电流的起源提供了一些深刻见解。
