Magneto-optical spectroscopy of epitaxial CoxFe3-xO4 (001) thin films

Autor
Wang, S.
Onoda, H.
Datum vydání
2023Publikováno v
Journal of the Magnetics Society of JapanRočník / Číslo vydání
47 (6)ISBN / ISSN
ISSN: 1882-2924Metadata
Zobrazit celý záznamKolekce
Tato publikace má vydavatelskou verzi s DOI 10.3379/msjmag.2311R001
Abstrakt
The magneto-optical (MO) spectra of spinel cobalt ferrite thin films with different distortions were measured in a broad range of 0.59 - 3.54 eV. Instead of using the cation substitution method, we prepared cobalt ferrite thin films with local distortion by using a RF magnetron sputtering method on an Mg(2)SnO(4) buffer layer to induce epitaxial strain. We derived the diagonal and off-diagonal elements of the dielectric tensor to investigate the influence of distortion on the MO effect in the films. In the spectra of the off-diagonal dielectric elements, the transitions at 0.8, 1.8, and 2.0 eV, which correspond to the optical transitions of tetrahedral (Co(2+)) and octahedral [Co(2+)], [Fe(3+)], were assigned to crystal field (CF) transitions: (Co(2+)):(4)A(2) - T1(F), (4)A(2) - (4)T(1)(P) and intervalence charge transfer (IVCT) transition: [Co(2+)]t(2g) - [Fe(3+)]t(2g), respectively. This result revealed that the Co ions were present in both the tetrahedral and octahedral sites in the epitaxial CFO thin films. By comparing the relative amplitude of each MO transition of cobalt ferrite thin films with different distortions, we found that MO spectroscopy is a highly promising tool for evaluating local distortions.
Klíčová slova
cobalt ferrite, dielectric tensor, magnetic anisotropy, magneto-optical spectroscopy, thin films
Trvalý odkaz
https://hdl.handle.net/20.500.14178/2323Licence
Licence pro užití plného textu výsledku: Creative Commons Uveďte původ 4.0 International