### Session H12: Lattice and Magnetic Properties of Multiferroics

8:00 AM–11:00 AM, Tuesday, March 11, 2008
Morial Convention Center Room: 203

Chair: Andrei Sushkov, University of Maryland

Abstract ID: BAPS.2008.MAR.H12.10

### Abstract: H12.00010 : Anomalous low-temperature magnetic ordering and spin-phonon coupling in BiFeO$_{3}$ thin films

9:48 AM–10:00 AM

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#### Authors:

Manoj Singh
(Department of Physics and Institute of Functional Nano Materials, University of Puerto Rico, PR,USA )

Ram Katiyar
(Department of Physics and Institute of Functional Nano Materials, University of Puerto Rico, PR, USA )

W. Prellier
(Laboratoire CRISMAT, CNRS , ENSICAEN, Caen Cedex, France)

H.M. Jang
(Department of Materials Science and Engineering , Pohang University of Science and Technology, Pohang, Korea)

Low-temperature magnetic properties and Raman spectra of epitaxal BiFeO$_{3}$ (BFO) thin films grown on (111) SrTiO$_{3}$ substrates have been studied. Zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves showed a large discrepancy beginning at a characteristic temperature which did depend on the magnetic-field strength, suggesting a spin-glass-like behavior of the epitaxial BFO film with R3c symmetry. For all three major A$_{1}$-symmetry Raman modes (138, 170, and 214 cm$^{-1})$, there was a good linear correlation between the mode-frequency softening and the square of the in-plane magnetization in the temperature range between 80 and 300 K. These observations were ascribed to the spin-phonon coupling below the N\'{e}el temperature (T$_{N }$= 643 K).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.H12.10