Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Micro and Nanostructured Magnetic Materials I

MA 2.3: Vortrag

Montag, 25. Februar 2008, 10:45–11:00, EB 301

CoCrPt-SiO2 films on SiO2 spherical particle arrays — •Christoph Brombacher¹, Felix Springer², Hartmut Rohrmann³, Martin Kratzer³, Magdalena Parlinska⁴, Stephan Meier⁴, Peter Kappenberger⁴, and Manfred Albrecht¹ — ¹Chemnitz University of Technology, Institute of Physics, Germany — ²University of Konstanz, Department of Physics, Germany — ³OC Oerlikon Balzers AG, Data Storage, Liechtenstein — ⁴Empa - Materials Science & Technology, Dübendorf, Switzerland

CoCrPt-SiO2 is a granular material consisting of small magnetically decoupled grains and is commonly used for perpendicular magnetic recording applications. In this study, the system was deposited onto SiO2 spherical particle arrays with diameters down to 10nm to form arrays of magnetic nanostructures. TEM studies reveal that the growth of CoCrPt-SiO2 particles remains columnar with the (0001) orientation of individual grains pointing perpendicular to the particle surface. By varying the growth conditions of a Ru seed-layer, the degree of intergranular exchange coupling was controlled, leading to pronounced differences in the magnetic domain structure and its magnetic reversal behavior. Multidomain magnetic caps have been obtained for magnetically decoupled grains and increasing the coupling results in the formation of single-domain magnetic caps. In this presentation, the magnetic properties depending on the particle size as well as the angular dependence of the reversal behavior will be discussed with respect to the differences in intergranular exchange coupling.

This work was supported by the European project MAFIN.