Theoretical prediction of rotating magnon wavepacket in ferromagnets

Details Theoretical prediction of rotating magnon wavepacket in ferromagnets Theoretical prediction of rotating magnon wavepacket in ferromagnets

2011-03-07

arxiv.org/abs/1103.1221v3

Phys. Rev. Lett. 106, 197202, 2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4pages, 2figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.106.197202

We theoretically show that the magnon wavepacket has a rotational motion in two ways; a self-rotation and a motion along the boundary of the sample (edge current). They are similar to cyclotron motion of electrons, but unlike electrons the magnons have no charge and the rotation is not due to Lorenz force. These rotational motions are caused by the Berry phase in momentum space from magnon band structure. Furthermore, these rotational motions of the magnon give an additional correction term to the magnon Hall effect. We also discuss the Berry curvature effect in the classical limit of long-wavelength magnetostatic spin waves having macroscopic coherence length.

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