2007/06/30 by Rogério de Sousa, Rogerio de Sousa, Joel E. Moore · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Anisotropy #Condensed matter physics #Coupling (piping) #Dielectric #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Ferromagnetism #Magneto-Optical Properties and Applications #Magnon #Materials science #Multiferroics #Multiferroics and related materials #Phonon #Physics #Quantum mechanics #Spin (aerodynamics) #Spin wave #cond-mat.mtrl-sci #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.012406
published as Phys. Rev. B 77, 012406 (2008) · Final published version
arxiv created 2008/01/23 · openalex publication_date 2008/01/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The 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 magnetodielectric resonances due to the coupling of optical phonons at zero wave vector to magnons at integer multiples of the cycloid wave vector. 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.