Nonreciprocal Directional Dichroism and Toroidalmagnons in Helical Magnets

Details Nonreciprocal Directional Dichroism and Toroidalmagnons in Helical Magnets Nonreciprocal Directional Dichroism and Toroidalmagnons in Helical Magnets

2012-01-31

arxiv.org/abs/1201.6458v1

J. Phys. Soc. Jpn. 81 (2012) 023712 (4 pages)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures

Scientific paper

10.1143/JPSJ.81.023712

We investigate a dynamical magnetoelectric effect due to a magnetic resonance in helical spin structures through the coupling between magnetization and electric polarization via a spin current mechanism. We show that the magnon has both the dynamical magnetic moment $\Delta M^\omega$ and the electric moment $\Delta P^\omega$ ($\perp \Delta M^\omega$), i.e., a dynamical toroidal moment, under external magnetic fields, and thus it is named the {\em toroidalmagnon}. The toroidalmagnon exists in most conical spin structures owing to the generality of the spin current mechanism. In the absorption of electromagnetic waves, the toroidalmagnon excitation process generally induces a nonreciprocal directional dichroism as a consequence of an interference of the magnetic and electric responses.

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