Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 27: Spindynamik II

MA 27.6: Vortrag

Dienstag, 8. März 2005, 16:30–16:45, TU H1012

FMR study of thin Fe layers grown on hexagonal GaN — •Matthias Buchmeier¹, Ralph Meijers², Raffaella Calarco², and Daniel E. Bürgler¹ — ¹Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich — ²Institut für Schichten und Grenzflächen, Forschungszentrum Jülich GmbH, 52425 Jülich

Fe films with thicknesses between 5 nm and 50 nm have been prepared by MBE on top of GaN(0001) substrates. XRD and LEED results suggest the growth in crystallographic Fe(110) domains with three different orientations. The magnetic properties have been investigated by in-plane angle-dependent FMR at frequencies from 4.5 GHz to 15.5 GHz. All samples show a weak thickness-independent hexagonal in-plane anisotropy with hard-axis saturation field of 8 mT. The FMR linewidth versus frequency curves are linear with no zero-frequency offset indicating a good homogeneity of the magnetic properties over the sample area. However the effective damping parameter α shows a pronounced anisotropy and thickness dependence, with enhanced damping along the hard-axis and for thicker layers. We suggest that the additional damping can be explained by two-magnon scattering at defects which are due to the triple domain formation.