Magnonic spin-wave modes in CoFeB antidot lattices

Details Magnonic spin-wave modes in CoFeB antidot lattices Magnonic spin-wave modes in CoFeB antidot lattices

2010-06-21

arxiv.org/abs/1006.4038v1

Applied Physics Letters 97 (2010), 092506

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1063/1.3483136

In this manuscript time-resolved magneto-optical Kerr effect experiments on structured CoFeB films are presented. The geometries considered are two dimensional square lattices of micrometer-sized antidots, fabricated by a focused ion beam. The spin-wave spectra of these magnonic crystals show a novel precessional mode, which can be related to a Bloch state at the zone boundary. Additionally, another magnetic mode of different nature appears, whose frequency displays no dependence on the externally applied magnetic field. These findings are interpreted as delocalized and localized modes, respectively.

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