Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Magnetic Imaging
MA 32.3: Vortrag
Freitag, 30. März 2007, 11:30–11:45, H22
Imaging spin reorientation in Co/Pt multilayers on nanospheres — •Thomas Eimüller1, Edward Amaladass2, Till Ulbrich3, Ildico Guhr3, Tolek Tyliszczak4, and Manfred Albrecht3 — 1Ruhr-University of Bochum, Junior Research Group Magnetic Microscopy — 2Max-Planck-Institute for Metals Research, Stuttgart — 3University of Konstanz, Department of Physics — 4Advanced Light Source, LBNL, Berkeley, CA, USA
Co/Pt multilayers have been deposited on arrays of self-assembled polystyrene particles with diameters of 270 nm and 720 nm. The film thickness of the produced nanocaps varies in radial direction and so do the magnetic properties, most notable the magneto-crystalline anisotropy. Since the easy axis of a Co/Pt multilayer changes from parallel to perpendicular to the film plane below a critical thickness a spin reorientation transition (SRT) across the particle surface has been predicted. We used high resolution scanning transmission x-ray microscopy (STXM) and magnetic circular dichroism (XMCD) as a magnetic contrast to investigate this transition. The magnetization reversal of the nanocaps could be studied in detail by sweeping an applied in-plane magnetic field. The obtained results are compared with micromagnetic simulations.
This work is funded by the DFG through the SFB491, Nachwuchsgruppe N1, the SFB 513, the Emmy-Noether program and the country Baden-Württemberg via the Kompetenznetz "Magnetic Nanostructures".