Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001)
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https://doi.org/10.48693/231
https://doi.org/10.48693/231
| Title: | Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001) |
| Authors: | Thien, Jannis Bahlmann, Jascha Alexander, Andreas Ruwisch, Kevin Rodewald, Jari Pohlmann, Tobias Hoppe, Martin Alarslan, Fatih Steinhart, Martin Altuncevahir, Baki Shafer, Padraic Meyer, Carola Bertram, Florian Wollschläger, Joachim Küpper, Karsten |
| ORCID of the author: | https://orcid.org/0000-0001-9304-3015 https://orcid.org/0000-0001-5551-7240 https://orcid.org/0000-0002-5241-8498 https://orcid.org/0000-0001-9363-2557 https://orcid.org/0000-0003-0851-2767 https://orcid.org/0000-0001-9002-4118 https://orcid.org/0000-0002-3043-3718 https://orcid.org/0000-0003-0364-9385 |
| Abstract: | 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. |
| Citations: | Thien J, Bahlmann J, Alexander A, Ruwisch K, Rodewald J, Pohlmann T, Hoppe M, Alarslan F, Steinhart M, Altuncevahir B, Shafer P, Meyer C, Bertram F, Wollschläger J, Küpper K. Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001). Materials. 2022; 15(1):46. |
| URL: | https://doi.org/10.48693/231 https://osnadocs.ub.uni-osnabrueck.de/handle/ds-202301278062 |
| Subject Keywords: | cobalt ferrite; ultrathin films; magnetic properties; cationic distribution |
| Issue Date: | 22-Dec-2021 |
| License name: | Attribution 4.0 International |
| License url: | http://creativecommons.org/licenses/by/4.0/ |
| Type of publication: | Einzelbeitrag in einer wissenschaftlichen Zeitschrift [Article] |
| Appears in Collections: | FB06 - Hochschulschriften Open-Access-Publikationsfonds |
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|---|---|---|---|---|
| materials_Thien_etal_2021.pdf | Article | 5,1 MB | Adobe PDF | materials_Thien_etal_2021.pdf  View/Open |
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