Evidence of non-Dzyaloshinskii-Moriya ferromagnetism in epitaxial BiFeO(3) films

Journal article (2011)

Authors

VG Prokhorov External organisation
GG Kaminsky External organisation
JM Kim External organisation
TW Eom External organisation
JS Park External organisation
YP Lee External organisation
V. Svechnikov QN/High Resolution Electron Microscopy
GG Levtchenko External organisation
YM Nikolaenko External organisation
VA Khokhlov External organisation
Research Group
QN/High Resolution Electron Microscopy
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Published Date

2011

Language

English

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Research Group

QN/High Resolution Electron Microscopy

Abstract

-ray diffraction analysis and high-resolution electron microscopy of BiFeO(3) films prepared by dc magnetron sputtering on single-crystal LaAlO(3) (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.