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- Title
Origin of the light-induced spin currents in heavy metal/magnetic insulator bilayers.
- Authors
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
- Abstract
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/Y3Fe5O12 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 Y3Fe5O12 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. The authors study the light-induced spin current observed in W/Y3Fe5O12 heterojunctions, elucidating the photo-generated spin current, rather than light-thermally induced spin current, by photon-magnon interaction.
- Subjects
MAGNETIC insulators; BILAYERS (Solid state physics); PHOTOVOLTAIC effect; HEAVY metals; MAGNONS; SEEBECK effect
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48710-6