Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetic Thin Films I

MA 15.11: Talk

Tuesday, February 26, 2008, 13:00–13:15, H 1012

Exchange coupled ordered and disordered FePt layers on MgO (100) — •Claudia Hürrich, Ludwig Schultz, and Sebastian Fähler — IFW Dresden, Institute for Metallic Materials, P. O. Box 270116, 01069 Dresden, Germany

Due to the high magnetocrystalline anisotropy FePt is a possible future medium for magnetic recording systems. Highly ordered FePt however can reach coercivities above 7 T, a field excluding any writing field. In order to obtain both, thermal stability and writability, exchange coupled media have been suggested [1]. Here experimental results on granular hard/soft FePt-bilayers are presented, which were prepared depositing the first layer at high temperatures and then reducing the deposition temperatures. Series of epitaxial bilayers deposited at different thicknesses and temperatures are used to show that indeed thermal stability can be maintain partially while coercivity is reduced significant. [1] D. Suess, T. Schrefl, S. Fähler, M. Kirschner, G. Hrkac, F. Dorfbauer and J. Fidler, Appl. Phys. Lett. 87, 2005, 012504