Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 27: Micro- and Nanostructured Magnetic Materials II

MA 27.1: Talk

Thursday, March 29, 2007, 15:15–15:30, H22

Magnetostatic interactions in patterned CoPt films embedded in a Permalloy matrix — •Sven Schnittger¹, Sebastian Dreyer¹, Christian Jooss¹, Sibylle Sievers², and Uwe Siegner² — ¹Institut für Materialphysik, Universität Göttingen — ²Physikalisch-Technische Bundesanstalt, Braunschweig

In order to study magnetostatic interactions in magnetic arrays, a two-dimensional pattern of hard magnetic (001) L1₀ CoPt squares embedded into a Permalloy matrix was fabricated. The structural and magnetic properties of arrays with different interelement distances were characterized by magneto-optical measurements, atomic force and magnetic force microscopy. The hard magnetic squares are not exchange-coupled to the soft magnet, yet a magnetostatic coupling was observed. This dipolar coupling modifies the domain structure of the Permalloy matrix. In periodic arrays of embedded CoPt squares, the stray-field interaction induces a symmetry-breaking, long-range ordered domain pattern in the soft magnetic matrix and short-range correlations of edge domains in adjacent CoPt squares.

S. Schnittger, S. Dreyer, Ch. Jooss, S. Sievers, and U. Siegner, submitted