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, Teruo Ono

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Article number100407
JournalPhysical Review B
Issue number10
Publication statusPublished - 2020 Sept


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