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Applied Physics Letters / Volume 97 / Issue 9 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 97, 092506 (2010); http://dx.doi.org/10.1063/1.3483136 (3 pages)

Magnonic spin-wave modes in CoFeB antidot lattices

Henning Ulrichs, Benjamin Lenk, and Markus Münzenberg

I. Institute of Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

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(Received 10 June 2010; accepted 5 August 2010; published online 1 September 2010)

In this paper 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 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.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

focused ion beam technology, Kerr magneto-optical effect, localised modes, spin dynamics, spin waves

PACS

  • 75.30.Ds

    Spin waves

  • 78.20.Ls

    Magneto-optical effects

  • 75.40.Gb

    Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3483136

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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