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MA: Fachverband Magnetismus

MA 32: Magnetic Imaging

MA 32.2: Vortrag

Freitag, 30. März 2007, 11:15–11:30, H22

Strong increase in the perpendicular magnetic anisotropy by growing Fe/Gd thin films on nanospheres — •Edward Amaladass¹, Thomas Eimüller², Tolek Tyliszczak³, Bernd Ludescher¹, and Gisela Schütz¹ — ¹Max-Planck-Institute for Metals Research, Heisenbergstr. 3, 70569 Stuttgart — ²Ruhr-University of Bochum, Junior Research Group Magnetic Microscopy, — ³Advanced Light Source, 1 Cyclotron Road, Berkeley, CA 94720, USA

A defined altering of the properties of magnetic materials is of great importance both from a fundamental and technological point of view. Fe/Gd multilayers are studied on flat silicon substrates and on self assembled silica nanospheres with diameters varying from 160 to 800 nm. A drastic change in the shape of the hysteresis loop, which is due to the strong increase in the perpendicular magnetic anisotropy, is observed by polar MOKE measurements for the film on nanospheres. The fact that the film is separated in isolated islands of equal size leads to a very pronounced squareness of the magnetization loop with a coercive field in the order of a few mT. The micromagnetic behavior was probed with a high lateral resolution by scanning transmission x-ray microscopy (STXM) and x-ray photoemission electron microscopy (X-PEEM) using x-ray magnetic circular dichroism (XMCD). STXM images taken in an in-plane magnetic field show different magnetization reversal behavior for the system on flat surface and on the nanospheres.