Optical properties and magnetochromism in multiferroic BiFeO3

X. S. Xu, T. V. Brinzari, S. Lee, Ying-hao Chu, L. W. Martin, A. Kumar, S. McGill, R. C. Rai, R. Ramesh, V. Gopalan, S. W. Cheong, J. L. Musfeldt

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Abstract

In order to investigate spin-charge coupling in multiferroic oxides, we measured the optical properties of BiFeO3. Although the direct 300 K charge gap is observed at 2.67 eV, absorption onset actually occurs at much lower energy with Fe3+ excitations at 1.41 and 1.90 eV. Temperature and magnetic-field- induced spectral changes reveal complex interactions between on-site crystal-field and magnetic excitations in the form of magnon sidebands. We employ the sensitivity of these magnon sidebands to map out the magnetic-field-temperature phase diagram which demonstrates optical evidence for spin spiral quenching above 20 T and suggests a spin domain reorientation near 10 T.

Original languageEnglish
Article number134425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number13
DOIs
StatePublished - 1 Apr 2009

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    Xu, X. S., Brinzari, T. V., Lee, S., Chu, Y., Martin, L. W., Kumar, A., McGill, S., Rai, R. C., Ramesh, R., Gopalan, V., Cheong, S. W., & Musfeldt, J. L. (2009). Optical properties and magnetochromism in multiferroic BiFeO3. Physical Review B - Condensed Matter and Materials Physics, 79(13), [134425]. https://doi.org/10.1103/PhysRevB.79.134425