Ultrafast magnetic vortex core switching driven by topological inverse Faraday effect

Details Ultrafast magnetic vortex core switching driven by topological inverse Faraday effect Ultrafast magnetic vortex core switching driven by topological inverse Faraday effect

2012-04-10

arxiv.org/abs/1204.2052v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

An unconventional inverse Faraday effect induced by a circularly polarized light in the presence of the topological magnetic structure is studied theoretically. We calculate the effective magnetic field acting on the local magnetic moment by using the nonequilibrium Green's function formalism. The effective field arises when the magnetic structure has a topological nature and induces magnetization dynamics. By using numerical calculations, we demonstrate that the ultrafast magnetic vortex core switching ($\sim 100$ ps) is realized by irradiating a light with the circularly polarization whose direction is chosen by the topological number of the magnetic vortex.

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