Interplay between magnetic and lattice excitations in BiFeO${}_3$

Abstract

We have performed Raman scattering investigations on the high energy magnetic excitations in a BiFeO${}_3$ single crystal as a function of both temperature and laser excitation energy. A strong feature observed at 1250 cm${}^{-1}$ in the Raman spectra has been previously assigned to two phonon overtone. We show here that its unusual frequency shift with the excitation energy and its asymmetric temperature dependent Fano lineshape reveal a strong coupling to magnetic excitations. In the same energy range, we have also identified the two-magnon excitation with a temperature dependence very similar to $\alpha$-Fe${}_2$O${}_3$ hematite.

References in corpus (9)

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• Built-in electric field induces polarization rotation in bilayer BiFeO3/(Ba,Sr)TiO3 thin films
• 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