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Optical spin-orbit torque in heavy metal-ferromagnet heterostructures.

ABSTRACT: 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.

SUBMITTER: Choi GM

PROVIDER: S-EPMC7083953 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Optical spin-orbit torque in heavy metal-ferromagnet heterostructures.

Choi Gyung-Min GM Oh Jung Hyun JH Lee Dong-Kyu DK Lee Seo-Won SW Kim Kun Woo KW Lim Mijin M Min Byoung-Chul BC Lee Kyung-Jin KJ Lee Hyun-Woo HW

Nature communications 20200320 1

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 coupli ...[more]

PMID: 32198358

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