Evidence of non-Dzyaloshinskii–Moriya ferromagnetism in epitaxial BiFeO3 films
| Autor: | T. W. Eom, V. A. Khokhlov, V. L. Svetchnikov, J. M. Kim, Yu. M. Nikolaenko, Y. P. Lee, G. G. Levtchenko, Junghum Park, G. G. Kaminsky, V. G. Prokhorov |
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| Rok vydání: | 2011 |
| Předmět: |
crystal structure
Materials science Physics and Astronomy (miscellaneous) Zener effect Condensed matter physics General Physics and Astronomy Crystal structure Sputter deposition superparamagnetism Epitaxy X-ray diffraction magnetic epitaxial layers Ferromagnetism bismuth compounds ferromagnetic materials X-ray crystallography Orthorhombic crystal system sputter deposition Superparamagnetism |
| Zdroj: | Low Temperature Physics, 37 (2), 2011 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.3555838 |
| Popis: | X-ray diffraction analysis and high-resolution electron microscopy of BiFeO3 films prepared by dc magnetron sputtering on single-crystal LaAlO3 (001) substrates reveal that the films have a highly c-oriented orthorhombic crystalline structure. The magnetic properties of the BiFeO3 films are typical of ensembles of interacting superparamagnetic clusters, rather than Dzyaloshinskii-Moriya weak ferromagnets. The appearance of extrinsic nanoscale superparamagnetic clusters is explained by an oxygen deficiency in certain regions of the film, where ferromagnetic ordering can be realized through a double-exchange Zener mechanism. |
| Databáze: | OpenAIRE |
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