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. 2014 Apr 4;112(13):137201.
doi: 10.1103/PhysRevLett.112.137201. Epub 2014 Apr 2.

Magneto- to electroactive transmutation of spin waves in ErMnO3

L Chaix  1 , S de Brion  2 , S Petit  3 , R Ballou  2 , L-P Regnault  4 , J Ollivier  5 , J-B Brubach  6 , P Roy  6 , J Debray  2 , P Lejay  2 , A Cano  7 , E Ressouche  4 , V Simonet  2
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Free article

Magneto- to electroactive transmutation of spin waves in ErMnO3

L Chaix et al. Phys Rev Lett. .
Free article

Abstract

The low-energy dynamical properties of the multiferroic hexagonal perovskite ErMnO3 have been studied by inelastic neutron scattering as well as terahertz and far infrared spectroscopies on a synchrotron source. From these complementary techniques, we have determined the magnon and crystal field spectra and identified a zone center magnon excitable only by the electric field of an electromagnetic wave. Using a comparison with the isostructural YMnO3 compound and crystal field calculations, we propose that this dynamical magnetoelectric process is due to the hybridization of a magnon with an electroactive crystal field transition.

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