Spin-charge-lattice coupling through resonant multimagnon excitations in multiferroic BiFeO3

Ramirez, M. O.; Kumar, A.; Denev, S. A.; Chu, Y. H.; Seidel, J.; Martin, L. W.; Yang, S.-Y.; Rai, R. C.; Xue, X. S.; Ihlefeld, J. F.; Podraza, N. J.; Saiz, E.; Lee, S.; Klug, J.; Cheong, S. W.; Bedzyk, M. J.; Auciello, O.; Schlom, D. G.; Orenstein, J.; Ramesh, R.
April 2009
Applied Physics Letters;4/20/2009, Vol. 94 Issue 16, p161905
Academic Journal
Spin-charge-lattice coupling mediated by multimagnon processes is demonstrated in multiferroic BiFeO3. Experimental evidence of two- and three-magnon excitations as well as multimagnon coupling at electronic energy scales and high temperatures are reported. Temperature dependent Raman experiments show up to five resonant enhancements of the two-magnon excitation below the Néel temperature. These are shown to be collective interactions between on-site Fe d-d electronic resonance, phonons, and multimagnons.


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