Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)
MA 13.17: Poster
Dienstag, 24. März 2009, 10:15–13:00, P1A
Fe- Pd thin films: A prototype system for exchange coupling? — •Thomas Schied1,2, Jörg Buschbeck1, Ludwig Schultz1,2, and Sebastian Fähler1,2 — 1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 2Institute for Solid State Physics, Department of Physics, Dresden University of Technology, 01062 Dresden, Germany
High performance hard magnetic films are a key requirement for applications in Micro Electro Mechanical Systems (MEMS) and as perpendicular magnetic recording media. Both applications are expected to benefit from exchange coupled hard/soft magnets. Whereas several L10 ordered systems such as Fe-Pt, Co-Pt and Fe-Pd are known to exhibit a sufficiently high magneto crystalline anisotropy, the Fe-Pd system is the only L10 system thermodynamically demixing into a high Ku hard magnetic and a high Js soft magnetic phase. In this work composition spreads of Fe-Pd are prepared by magnetron sputtering from elemental Fe and Pd targets, covering most of the composition range from the high Js Fe-rich phase to the high Ku L10 phase. Local magnetic properties are analyzed using a scanning magnetometer based on the polar magneto optical Kerr-effect. Together with structural investigations by XRD and surface morphology by AFM the key properties are analyzed locally. These information*s are used to correlate magnetic properties with composition, phase formation and micro structure. In order to obtain an alignment of the easy axis perpendicular to the substrate the influence of two different heated substrates - Si/SiO wafers without buffer and Si/SiO wafers with MgO buffer - is investigated.