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Anomalous magnetic ordering transition and induced Raman scattering in BiFeO3 thin films

Published online by Cambridge University Press:  01 February 2011

Manoj K Singh
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, fukandobasu , upr, sanjuan, San Juan, N/A, India, 787-925-2050
W Prellier
Affiliation:
[email protected], Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, 6 Bd du Maréchal Juin, F-14050 Caen Cedex, France, Caen, 14050, France
H M Jang
Affiliation:
[email protected], Pohang University of Science and Technology (POSTECH), Department of Materials Science and Engineering and Department of Physics, Pohang, 790-784, Korea, Republic of
Ram S Katiyar
Affiliation:
[email protected], University of Puerto Rico, PR, 1Department of Physics and Institute of Functional Nano materials, SanJuan, 00931, Puerto Rico
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Abstract

Low temperature magnetic properties and Raman spectrum of highly (111)-oriented rhombohedral BiFeO3 (BFO) thin films epitaxially grown on (111) SrTiO3 substrates by pulsed laser deposition have been studied. Zero field cooled (ZFC) and field cooled (FC) magnetization curves display divergence at characteristic temperature Tirr (H), which are magnetic field dependent, suggesting a spin-glass like behavior of the film. The change in magnetic ordering results in anomalous phonon behavior such as the extraordinary enhancement and appearance of new Raman modes due to Brillouin zone folding below ∼200 K.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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