Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 36: Magnetic Coupling Phenomena / Exchange-Bias
MA 36.9: Vortrag
Freitag, 31. März 2006, 12:45–13:00, HSZ 401
Magnetic Multilayer Systems on Nanospheres: Experiments and Simulations — •T. C. Ulbrich1, I. Guhr1, S. van Dijken2, T. Eimüller3, P. Fischer4, and M. Albrecht1 — 1University of Konstanz, Department of Physics, 78457 Konstanz, Germany — 2SFI Trinity Nanoscience Laboratory, Physics Department, Trinity College, Dublin 2, Ireland — 3Ruhr-Universitaet Bochum, Department of Experimantal Phyics, NB4/130, 44780 Bochum, Germany — 4LBNL/CXRO, MS 2-400, Berkeley, CA 94720 U.S.A
We report on a combination of a topographic pattern formed of self-assembled polystyrene particles with sizes as small as 50 nm and film deposition. Using Co/Pt multilayer films, the so formed nanocaps on top of a sphere are monodisperse, reveal a uniform magnetic anisotropy and are magnetically exchange isolated. The film thickness varies and so do the magnetic properties most notable the magneto-crystalline anisotropy across the cap [1]. For Co/Pt multilayer film deposition, the anisotropy direction depends on the Co layer thickness, thus, changing the orientation from parallel to perpendicular to the particle surface below a critical thickness. Therefore, systems with a spin reorientation transition across the cap can be created. Moreover, by combining bilayers consiting of Co/Pt multilayers and MnPt or FeNi layers on the particle array, coupling effects such as exchange bias or exchange spring coupling can be investigated. First results will be presented and compared to micromagnetic simulations. This project is funded by the DFG through the SFB 513 and the Emmy-Noether program at the University of Konstanz.
[1] M. Albrecht et al., Nature Materials 4, 203 (2005).