Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Micro- and Nanostructured Magnetic Materials III

MA 23.8: Vortrag

Donnerstag, 25. März 2010, 12:00–12:15, H3

Anisotropies of permalloy elements in multidomain states — •Sabine Pütter, Mahmoud Reza Rahbar Azad, Nikolai Mikuszeit, Moritz Bubek, Germar Hoffmann, and Hans Peter Oepen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

The artificial fabrication of nano– and microstructures, e. g. by mask techniques, comes along with the problem that edge faces are not perfectly perpendicular to the substrate plane; a tapered shape is produced, which results in a reduced shape anisotropy [1].

To study this effect experimentally, we fabricated arrays of isolated thin permalloy cuboids of about 15 nm thickness and investigated them by means of the magneto-optical Kerr effect and atomic force microscopy. As the lateral dimensions of the elements are in the low micron range multi-domain states must be considered when deriving the anisotropy from hysteresis loops. In addition to the shape anisotropy we extract an anisotropy from hard axis minor loops and relate it to zero remanent states. Our results confirm the theoretical predictions for single as well as for arrays of coupled elements.

[1] S. Pütter et al., J. Appl. Phys. 106, 043916 (2009)