One-magnon light scattering and spin-reorientation transition in epitaxial BiFeO3 thin films

Singh, Manoj K. and Dussan, S. and Prellier, W. and Katiyar, Ram S.. (2009) One-magnon light scattering and spin-reorientation transition in epitaxial BiFeO3 thin films. Journal of Magnetism and Magnetic Materials, 321 (11). pp. 1706-1709. ISSN 03048853

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Abstract

Raman scattering from one-magnon excitation has been observed for the first time in epitaxial BiFeO3 thin films grown on (1 1 1) SrTiO3 substrates. The intensities and the frequency of the magnon mode at 18.9 cm−1 (M1) showed a discrepancy at the characteristic temperatures of not, vert, similar140 and 200 K and the magnon mode at 27.9 cm−1 (M2) disappeared at not, vert, similar200 K suggesting spin-reorientation (SR) transition in the epitaxial BFO film. The dc susceptibility measurement showed a large discrepancy near these two temperatures evidently elucidating the spin-reorientation transition mechanism. The partial spectral weight of the magnon modes is believed to be transferred to the lowest phonon mode appearing at 72.8 cm−1 and higher magnon mode M2 disappearing near 200 K reveal magnon–phonon coupling near to SR transition.

Item Type: Article
InterNano Taxonomy: Nanomanufacturing Characterization Techniques > Optical Spectroscopy > Raman spectroscopy
Nanoscale Objects and Nanostructured Materials > Nanocomposites > Thin films
Nanomanufacturing Characterization Techniques > Magnetic Characterization
Collections: Nanomanufacturing Research Collection
Depositing User: Moureen Kemei
Date Deposited: 22 Feb 2010 22:01
Last Modified: 22 Feb 2010 22:01
URI: http://eprints.internano.org/id/eprint/305

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