Orbital-dependent electric field effect on magnetism in ultrathin cobalt

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 demons...

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Bibliographic Details
Published in:Physical review. B 2020-09, Vol.102 (10), p.1, Article 100407
Main Authors: Yamada, Kihiro T., Shiota, Yoichi, Koyama, Tomohiro, Kotani, Yoshinori, Toyoki, Kentaro, Mizuno, Hayato, Ando, Fuyuki, Nakamura, Kohji, Nakamura, Tetsuya, Chiba, Daichi, Ono, Teruo
Format: Article
Language:English
Subjects:
Curie temperature
Dichroism
Electric fields
Ferromagnetism
Magnetism
Orbitals
Sum rules
X ray absorption
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.100407