Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.14: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Fe monolayers on InAs(001): An in situ study of surface, interface and volume magnetic anisotropy — •Florian M. Römer, Christoph Hassel, Khalil Zakeri, Cihan Tomaz, Igor Barsukov, Ralf Meckenstock, Jürgen Lindner, and Michael Farle — Fachbereich Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany.

The magnetic anisotropy of epitaxial Fe films with thicknesses in the range of 2−142 monolayers (ML) grown on {4×2} reconstructed InAs(001) was investigated by in situ ferromagnetic resonance. The easy magnetization direction was found to be parallel to the [110]-direction for Fe films below 4 monolayers, while it rotates by 45^∘ toward the [100]-direction. It is observed that both surface-interface and volume contribution to the perpendicular anisotropy favor an easy axis perpendicular to the film plane. The cubic surface-interface anisotropy is relatively large with easy axes along ⟨110⟩-directions in contrast to the volume contribution which favors easy axes along the ⟨110⟩-directions. The volume contribution is found to be larger than the Fe bulk cubic anisotropy. A thickness independent uniaxial anisotropy has been found in films with a thickness of 2 up to 142 monolayers. Changes due to capping with Pt/Ag will be shown.