• Rapid Communication

Orbital-dependent electric field effect on magnetism in ultrathin cobalt

Kihiro T. Yamada, Yoichi Shiota, Tomohiro Koyama, Yoshinori Kotani, Kentaro Toyoki, Hayato Mizuno, Fuyuki Ando, Kohji Nakamura, Tetsuya Nakamura, Daichi Chiba, and Teruo Ono
Phys. Rev. B 102, 100407(R) – Published 17 September 2020
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Abstract

Electric field modulations of magnetism in ferromagnetic metals are in general ascribed to the electric field effects on the orbitals. However, a direct observation of the electric-field-induced changes in the orbital states of a ferromagnetic metal is lacking. In this Rapid Communication, we demonstrate that an electric field applied to an ultrathin Co film can change the electron occupations according to the orbitals, combining x-ray absorption and x-ray magnetic circularly dichroism spectroscopies with the sum rules. Under a positive electric field, the dxz(yz)-occupied states decrease mainly via the modification of orbital hybridizations, while the dz2-occupied state increases. The changes in the dxz and dyz states dominantly alter the Curie temperature.

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  • Received 4 September 2019
  • Accepted 13 August 2020

DOI:https://doi.org/10.1103/PhysRevB.102.100407

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kihiro T. Yamada1,2,*, Yoichi Shiota1, Tomohiro Koyama3,4, Yoshinori Kotani5, Kentaro Toyoki5, Hayato Mizuno1, Fuyuki Ando1, Kohji Nakamura6, Tetsuya Nakamura5, Daichi Chiba3,4, and Teruo Ono1,4,†

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
  • 2Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
  • 3The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan
  • 4Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University Ibaraki 560-8531, Japan
  • 5Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
  • 6Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan

  • *Corresponding author: yamada@phys.titech.ac.jp
  • Corresponding author: ono@scl.kyoto-u.ac.jp

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Issue

Vol. 102, Iss. 10 — 1 September 2020

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