Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.44: Poster

Tuesday, February 26, 2008, 15:15–18:30, Poster E

FMR study of ordered submicronscale permalloy antidot arrays — •Stephan Martens, Kornelius Nielsch, and Detlef Görlitz — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg

Antidot arrays, consisting of lattices of holes in continuous magnetic films, exhibit periodic demagnetization field distributions, which effect the magnetic structure and properties in these films. Our almost squarely ordered 180 nm period antidot arrays with a mesh aperture of ∼ 80 nm have been prepared by vapor deposition of permalloy on porous anodic alumina substrates. We investigate the anisotropy field of our samples by means of ferromagnetic resonance (FMR) measurements, carried out at 9.2 GHz. The magnetic spectra reveal one uniform and multiple spin wave modes depending on the alignment of the film plane relative to the external field. These angle dependencies are compared with those of the coercive fields, previously observed via vibrating sample magnetometry [1].

[1] F. J. Castaño et al., Appl. Phys. Lett. 85, 2872 (2004)