Dynamical magneto-electric coupling in helical magnets

Abstract

Collective mode dynamics of the helical magnets coupled to electric polarization via spin-orbit interaction is studied theoretically. The soft modes associated with the ferroelectricity are not the transverse optical phonons, as expected from the Lyddane-Sachs-Teller relation, but are the spin waves hybridized with the electric polarization. This leads to the Drude-like dielectric function $\epsilon (\omega )$ in the limit of zero magnetic anisotropy. There are two more low-lying modes; phason of the spiral and rotation of helical plane along the polarization axis. The roles of these soft modes in the neutron scattering and antiferromagnetic resonance are revealed, and a novel experiment to detect the dynamical magneto-electric coupling is proposed.

5 pages, 1 figure

References in corpus (8)

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• Ferroelectricity in spiral magnets
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Cited by in corpus (106)

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• Laser-Driven Multiferroics and Ultrafast Spin Current Generation
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