Raman studies of spin-phonon coupling in hexagonal BaFe12O 19

Xiang Bai Chen, Nguyen Thi Minh Hien, Kiok Han, Jung Chul Sur, N. H. Sung, B. K. Cho, In Sang Yang

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Phonon softening in hexagonal BaFe12O19 single crystal is observed in temperature dependent polarized Raman spectroscopy. The phonon softening is significantly enhanced below ∼80 K, at which the magnetization in a magnetic field along c-axis shows a clear change in the temperature dependence, indicating a magnetic phase transition near 80 K. Possible interpretations of the anomalous temperature dependence of the phonon frequencies-phonon softening behaviors are discussed. The phonon softening would be correlated to local structural and magnetic phase transition in hexagonal BaFe12O19, in which the spin-phonon coupling would have major contribution for the phonon softening. We also discuss that the spin-phonon coupling would be affected by both the spin ordering and the individual phonon vibration in magnetic material.

Original languageEnglish
Article number013912
JournalJournal of Applied Physics
Issue number1
StatePublished - 7 Jul 2013


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