Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.20: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Granular CoCrPt:SiO2 recording media on assemblies of GaSb nanocones — •David Ball1, Stephan Günther2, Monika Fritzsche1, Gaspare Varvaro4, Denys Makarov2,3, Kilian Lenz1, Jürgen Fassbender1, and Manfred Albrecht2 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden — 2Institute of Physics, TU Chemnitz, 09126 Chemnitz — 3Institute for Integrative Nanosciences, IFW Dresden, P.O. Box 270116, 01069 Dresden — 4ISM-CNR, Via Salaria km 29.500, C.P. 10-00016 Monterotondo Scalo, Roma, Italy
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 different 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 c-axis 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.