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Magnetostatic interactions in patterned CoPt films embedded in a permalloy matrix

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5 Author(s)
Schnittger, S. ; Institut für Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany ; Dreyer, S. ; Jooss, Ch. ; Sievers, S.
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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 these arrays were characterized by magneto-optical measurements, atomic force and magnetic force microscopies. The hard magnetic squares are not exchange coupled to the soft magnet, yet a magnetostatic coupling was observed. This coupling modifies the domain structure of the permalloy matrix. In periodic arrays of embedded CoPt squares, the stray field interaction induces a long-range ordered domain pattern in the soft magnetic matrix and short-range correlations of edge domains in adjacent CoPt squares.

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Applied Physics Letters  (Volume:90 ,  Issue: 4 )