Granular CoCrPt:SiO2 recording media on assemblies of GaSb nanocones


Granular CoCrPt:SiO2 recording media on assemblies of GaSb nanocones

Ball, D.; Günther, S.; Fritzsche, M.; Varvaro, G.; Makarov, D.; Lenz, K.; Fassbender, J.; Albrecht, M.

Investigation of the magnetization reversal in arrays of magnetic nanostructures is relevant for both fundamental understanding as well as application for magnetic data storage.We present a study of the magnetization reversal in granular CoCrPt:SiO2 recording media with weakly interacting magnetic grains grown onto pre-structured templates fabricated by ion irradiation of GaSb. By tuning the irradiation conditions, assemblies of nanocones of dierent size and periodicity were prepared. Columnar CoCrPt grains with their c-axis normal to the surface of the cones were formed as evidenced by HR-TEM. The spread of the caxis of these grains results in a tilted easy magnetization axis with respect to the substrate normal. Investigation of the integral magnetic properties by vector-VSM reveals a decrease of the remanence with increasing cone size. The magnetic domain patterns observed by MFM suggest that the CoCrPt behaves as a single-domain cap structure on the cones. This work is supported by DFG FA 314-7.1 and AL 618-6.

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Publ.-Id: 15669