journal article·2022-10-18Open access

Spin pumping into anisotropic Dirac electrons

Takumi Funato, Takeo Kato, Mamoru Matsuo

Physical Review B· Volume 106· Issue 14

Abstract

We study spin pumping into an anisotropic Dirac electron system induced by microwave irradiation to an adjacent ferromagnetic insulator theoretically. We formulate the Gilbert damping enhancement due to the spin current flowing into the Dirac electron system using second-order perturbation with respect to the interfacial exchange coupling. As an illustration, we consider the anisotropic Dirac system realized in bismuth to show that the Gilbert damping varies according to the magnetization direction in the ferromagnetic insulator. Our results indicate that this setup can provide helpful information on the anisotropy of the Dirac electron system.
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Research context

OpenAlex topics: Magnetic properties of thin films · Quantum and electron transport phenomena · Topological Materials and Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Spintronics Research Network, Keio University, Yokohama 223-8522, Japan

Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan

CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China

Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan

RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan

Funding

Japan Science and Technology Agency · Japan Society for the Promotion of Science · Chinese Academy of Sciences

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