Optical coupling to spin waves in the cycloidal multiferroic BiFeO3

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dc.creatorde Sousa, Rogerio
dc.creatorMoore, Joel E.
dc.date2007-06-08
dc.date2008-01-23
dc.date.accessioned2026-07-07T08:55:43Z
dc.date.available2026-07-07T08:55:43Z
dc.descriptionThe magnon and optical phonon spectrum of an incommensurate multiferroic such as BiFeO3 is considered in the framework of a phenomenological Landau theory. The resulting spin wave spectrum is quite distinct from commensurate substances due to soft mode anisotropy and magnon zone folding. The former allows electrical control of spin wave propagation via reorientation of the spontaneous ferroelectric moment. The latter gives rise to multiple magneto-dielectric resonances due to the coupling of optical phonons at zero wavevector to magnons at integer multiples of the cycloid wavevector. These results show that the optical response of a multiferroic reveals much more about its magnetic excitations than previously anticipated on the basis of simpler models.
dc.descriptionFinal published version
dc.identifierhttps://arxiv.org/abs/0706.1260
dc.identifierhttp://arxiv.org/abs/0706.1260
dc.identifierPhys. Rev. B 77, 012406 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.012406
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/146365
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.subjectStatistical Mechanics
dc.titleOptical coupling to spin waves in the cycloidal multiferroic BiFeO3
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