Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 29: Mikro- und nanostrukturierte Materialien II
MA 29.7: Vortrag
Freitag, 28. März 2003, 12:15–12:30, HSZ/03
Spontaneously formed magnetic nanowires — •Andreas Westphalen and Katharina Theis-Bröhl — Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, Germany
The formation of nanometer-scale periodic structures on crystal surfaces has become a subject of intense experimental and theoretical interest. We used facetted crystal surfaces as substrates for preparation of magnetic nanowires. By annealing m-plane sapphire in air at high temperatures the surface facets into a regular hill-and-valley structure with a height of several tenth of nm and a period of hundreds of nm [1]. Deposition on one facet surface was achieved by evaporating iron from an effusion cell under an angle of 5o to the substrate [2]. This procedure leads to a periodically ordered nanowire film structure. AFM and FMM measurements, performed before and after deposition on the facetted surfaces, are presented and compared to SEM images and x-ray studies. In particular, we performed crystal truncation rod measurements which contain further information about the lateral structure. The magnetic porperties of the films were investigated via MOKE in longitudinal configuration. The structured films show a twofold shape anisotropy.
We acknowledge financial support through SFB 491.
[1] J. R. Heffelfinger, M. W. Bench, C. B. Carter, Surf. Sci. 343, L1161 (1995).
[2] M. Huth, K. A. Ritley, J. Oster, H. Adrian, Adv. Funct. Mater. 12, 333 (2002).