科研之友
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摘要
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 (perpendicular to Delta M-omega), i.e., a dynamical toroidal moment, under external magnetic fields, and thus it is named the 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.
- 出版日期2012-2
