A B Sushkov et al 2008 J. Phys.: Condens. Matter 20 434210 doi:10.1088/0953-8984/20/43/434210
A B Sushkov1, M Mostovoy2, R Valdés Aguilar1, S-W Cheong3 and H D Drew1
Show affiliationsWe summarize the existing experimental data on electromagnons in multiferroic RMn2O5 compounds, where R denotes a rare earth ion, Y or Bi, and discuss a realistic microscopic model of these materials based on the assumption that the microscopic mechanism of magnetically induced ferroelectricity and electromagnon absorption relies entirely on the isotropic Heisenberg exchange and magnetostrictive coupling of spins to a polar lattice mode and does not involve relativistic effects. This model explains many magnetic and optical properties of RMn2O5 manganites, such as the spin re-orientation transition, magnetically induced polarization, appearance of the electromagnon peak in the non-collinear spin state and the polarization of light for which this peak is observed. We compare experimental and theoretical results on electromagnons in RMn2O5 and RMnO3 compounds.
75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
78.20.Ls Magnetooptical effects
Issue 43 (29 October 2008)
Received 12 May 2008, in final form 5 June 2008
Published 9 October 2008
A B Sushkov et al 2008 J. Phys.: Condens. Matter 20 434210
Christopher J. Glosser and Carl R. Schmidt JHEP12(2002)016