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A Possible Origin of Ferromagnetism in Epitaxial BiFeO3 thin Films
Journal of Magnetics, Volume 11, Number 3, 30 Sep 2006, Pages 108-110
Abstract
We prepared (111) oriented BiFeO3 (BFO) thin films with the different thicknesses of 30, 70, and 200 nm using pulsed laser deposition. We examined relations between the ferromagnetism and strain of these films from xray diffraction and superconducting quantum interference device data. The saturation magnetization values of the films are independent of strain and rather dependent upon the thickness only. From the results, we suggest that the ferromagnetism in the BFO thin films originate from extrinsic factors such as the coexistence of Fe2+ and Fe3+.
Keywords: multiferroic; BiFeO3 thin film; ferromagnetism; oxygen vacancies
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