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Optical spin-orbit torque in heavy metal-ferromagnet heterostructures

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Title
Optical spin-orbit torque in heavy metal-ferromagnet heterostructures
Author(s)
Gyung-Min Choi; Jung Hyun Oh; Dong-Kyu Lee; Seo-Won Lee; Kun Woo Kim; Mijin Lim; Byoung-Chul Min; Kyung-Jin Lee; Hyun-Woo Lee
Subject
MAGNETIZATION, ; ELECTRONS, ; FILMS
Publication Date
2020-03
Journal
NATURE COMMUNICATIONS, v.11, no.1, pp.1482
Publisher
NATURE PUBLISHING GROUP
Abstract
© The Author(s) 2020 Spin current generation through the spin-orbit interaction in non-magnetic materials lies at the heart of spintronics. When the generated spin current is injected to a ferromagnet, it produces spin-orbit torque and manipulates magnetization efficiently. Optically generated spin currents are expected to be superior to their electrical counterparts in terms of the manipulation speed. Here we report optical spin-orbit torques in heavy metal/ferromagnet heterostructures. The strong spin-orbit coupling of heavy metals induces photo-excited carriers to be spin-polarized, and their transport from heavy metals to ferromagnets induces a torque on magnetization. Our results demonstrate that heavy metals can generate spin-orbit torque not only electrically but also optically. It is known that torques can be exerted on spins in a ferromagnet (FM) layer when an in-plane electric current is injected into a heavy metal (HM) layer in contact with the FM layer. Here, the authors demonstrate that torques can be generated without the current injection by shining instead circularly polarized light on the HM
URI
https://pr.ibs.re.kr/handle/8788114/8715
DOI
10.1038/s41467-020-15247-3
ISSN
2041-1723
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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