Observation of the Magnon Hall Effect

Details Observation of the Magnon Hall Effect Observation of the Magnon Hall Effect

2010-08-09

arxiv.org/abs/1008.1564v1

Science 329, 297 (2010)

Physics

Condensed Matter

Materials Science

12 pages, 4 figures. Submitted to Science on February 12 and published by Science on July 16, 2010 (10.1126/science.1188260).

Scientific paper

10.1126/science.1188260

The Hall effect usually occurs when the Lorentz force acts on a charge current in a conductor in the presence of perpendicular magnetic field. On the other hand, neutral quasi-particles such as phonons and spins can carry heat current and potentially show the Hall effect without resorting to the Lorentz force. We report experimental evidence for the anomalous thermal Hall effect caused by spin excitations (magnons) in an insulating ferromagnet with a pyrochlore lattice structure. Our theoretical analysis indicates that the propagation of the spin wave is influenced by the Dzyaloshinskii-Moriya spin-orbit interaction, which plays the role of the vector potential as in the intrinsic anomalous Hall effect in metallic ferromagnets.

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