期刊
MATERIALS
卷 15, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/ma15010046
关键词
cobalt ferrite; ultrathin films; magnetic properties; cationic distribution
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [KU2321/6-1, WO533/20-1]
- [DE-AC02-05CH11231]
This study presents the magnetic properties and cation ordering of ultrathin Co-rich cobalt ferrite films. The electronic structure and distribution of cations in the films were examined using various characterization techniques. The results show a partially inverse spinel structure and an increased amount of Co3+ cations in the low-spin state for one of the films.
Here, we present the (element-specific) magnetic properties and cation ordering for ultrathin Co-rich cobalt ferrite films. Two Co-rich CoxFe3-xO4 films with different stoichiometry (x=1.1 and x=1.4) have been formed by reactive solid phase epitaxy due to post-deposition annealing from epitaxial CoO/Fe3O4 bilayers deposited before on Nb-doped SrTiO3(001). The electronic structure, stoichiometry and homogeneity of the cation distribution of the resulting cobalt ferrite films were verified by angle-resolved hard X-ray photoelectron spectroscopy. From X-ray magnetic circular dichroism measurements, the occupancies of the different sublattices were determined using charge-transfer multiplet calculations. For both ferrite films, a partially inverse spinel structure is found with increased amount of Co3+ cations in the low-spin state on octahedral sites for the Co1.4Fe1.6O4 film. These findings concur with the results obtained by superconducting quantum interference device measurements. Further, the latter measurements revealed the presence of an additional soft magnetic phase probably due to cobalt ferrite islands emerging from the surface, as suggested by atomic force microscope measurements.
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