Spin-Charge-Lattice Coupling through Resonant Multi-Magnon Excitations in Multiferroic BiFeO3

Abstract

Spin-charge-lattice coupling mediated by multi-magnon processes is demonstrated in multiferroic BiFeO3. Experimental evidence of two and three magnons 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 2-magnon excitation below the Neel temperature. These are shown to be collective interactions between on-site Fe d-d electronic resonance, phonons and multimagnons

11 pages including figures

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• Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films
• Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO${}_3$
• Anharmonic magnon excitations in noncollinear and charge-ordered RbFe${}^{2+}$Fe${}^{3+}$F${}_6$
• Understanding electronic excited states in BiFeO${}_3$ via ab initio calculations and symmetry analysis
• Flipping of electronic spins in BiFeO${}_3$ via chiral $d-d$ excitations