Magnetic and Magnetoelectric Excitations in TbMnO3

A. Pimenov, A. Shuvaev, A. Loidl, F. Schrettle, A. A. Mukhin, V. D. Travkin, V. Yu. Ivanov, and A. M. Balbashov
Phys. Rev. Lett. 102, 107203 – Published 13 March 2009

Abstract

Magnetic and magnetoelectric excitations in the multiferroic TbMnO3 have been investigated at terahertz frequencies. Using different experimental geometries we can clearly separate the electroactive excitations (electromagnons) from the magnetoactive modes, i.e., antiferromagnetic resonances. Two antiferromagnetic resonances were found to coincide with electromagnons. This indicates that both excitations belong to the same mode and the electromagnons can be excited by a magnetic ac field as well. In spite of the 90° rotation of the magnetic cycloid in external magnetic fields, the electromagnons are observable for electric ac fields parallel to the a axis only.

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  • Received 24 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.107203

©2009 American Physical Society

Authors & Affiliations

A. Pimenov1, A. Shuvaev1, A. Loidl2, F. Schrettle2, A. A. Mukhin3, V. D. Travkin3, V. Yu. Ivanov3, and A. M. Balbashov4

  • 1Experimentelle Physik IV, Universität Würzburg, 97074 Würzburg, Germany
  • 2Experimentalpyhsik V, EKM, Universität Augsburg, 86135 Augsburg, Germany
  • 3General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
  • 4Moscow Power Engineering Institute, 105835 Moscow, Russia

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Vol. 102, Iss. 10 — 13 March 2009

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