Interface-induced field-like optical spin torque in a ferromagnet/heavy metal heterostructure

Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

Research output: Contribution to journalArticlepeer-review

Abstract

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, 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.

Original languageEnglish
Pages (from-to)1169-1176
Number of pages8
JournalNanophotonics
Volume10
Issue number3
DOIs
Publication statusPublished - 2021 Jan 3

Keywords

  • optical helicity
  • optical spin
  • optical spin torque
  • photospintronics
  • spin-orbit torque

ASJC Scopus subject areas

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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