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Yamada KT, Suzuki M, Pradipto AM, Koyama T, Kim S, Kim KJ, Ono S, Taniguchi T, Mizuno H, Ando F, Oda K, Kakizakai H, Moriyama T, Nakamura K, Chiba D, Ono T. Microscopic Investigation into the Electric Field Effect on Proximity-Induced Magnetism in Pt. Phys Rev Lett 2018; 120:157203. [PMID: 29756866 DOI: 10.1103/physrevlett.120.157203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Indexed: 06/08/2023]
Abstract
Electric field effects on magnetism in metals have attracted widespread attention, but the microscopic mechanism is still controversial. We experimentally show the relevancy between the electric field effect on magnetism and on the electronic structure in Pt in a ferromagnetic state using element-specific measurements: x-ray magnetic circular dichroism (XMCD) and x-ray absorption spectroscopy (XAS). Electric fields are applied to the surface of ultrathin metallic Pt, in which a magnetic moment is induced by the ferromagnetic proximity effect resulting from a Co underlayer. XMCD and XAS measurements performed under the application of electric fields reveal that both the spin and orbital magnetic moments of Pt atoms are electrically modulated, which can be explained not only by the electric-field-induced shift of the Fermi level but also by the change in the orbital hybridizations.
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Affiliation(s)
- K T Yamada
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - M Suzuki
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - A-M Pradipto
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Department of Physics Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - T Koyama
- Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
| | - S Kim
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - K-J Kim
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - S Ono
- Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa 240-0196, Japan
| | - T Taniguchi
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - H Mizuno
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - F Ando
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - K Oda
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - H Kakizakai
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - T Moriyama
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - K Nakamura
- Department of Physics Engineering, Mie University, Tsu, Mie 514-8507, Japan
| | - D Chiba
- Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
| | - T Ono
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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