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Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 20: Multiferroics

MA 20.9: Talk

Wednesday, February 27, 2008, 16:15–16:30, EB 202

Electromagnons in rare earth multiferroics DyMnO3 and TbMnO3 — •Alexey Shuvaev1, Alexander Mukhin2, Anatoli Balbashov3, Alois Loidl4, and Andrei Pimenov11Experimentelle Physik IV, Universität Würzburg, 94074 Würzburg, Germany — 2General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia — 3Moscow Power Engineering Institute, 111250 Moscow, Russia — 4Experimentalphysik V, EKM, Universität Augsburg, 86135 Augsburg, Germany

Dielectric permittivity spectra of rare earth multiferroic manganites DyMnO3 and TbMnO3 have been investigated in the terahertz frequency range. Similar to other multiferroics well-defined magnetoelectric excitations (electromagnons) are observed in the incommensurate magnetic phases below T = 40 K. Electromagnons are excitations of the incommensurate magnetic structure and, contrary to magnons, can be excited solely by electric component of the electromagnetic wave. Application of external magnetic fields strongly modifies the permittivity spectra in both compositions leading to magnetoelectric effects down to zero frequencies. In TbMnO3 and in moderate fields additional structure appears close to ν ∼ 10 cm−1 and is suppressed again for magnetic fields above 5 T. Manifestations of different magnetic phase boundaries in the spectra of the dielectric permittivity are discussed.

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