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MA: Fachverband Magnetismus

MA 18: Magnetic Thin Films II

MA 18.8: Vortrag

Mittwoch, 24. März 2010, 17:00–17:15, H3

(001) textured FePtCu thin films on amorphous SiO₂ substrates — •Christoph Brombacher¹, Christian Schubert¹, Patrick Matthes¹, Denys Makarov¹, Mireille Maret², Nathalie Boudet³, and Manfred Albrecht¹ — ¹Chemnitz University of Technology, Institute of Physics, Germany — ²Laboratory SIMAP, UJF, France — ³Institute Néel, MCMF, France

In this study, 5 nm thick (001) textured and chemically ordered FePtCu films have been prepared via rapid thermal annealing of FePt(5 nm - x)/Cu(x) bilayers sputter-deposited at room temperature onto thermally oxidized Si substrates. The thickness x of the Cu film was varied between 0 nm and 1.2 nm resulting in a Cu content between 0 at.% and 27 at.% verified by RBS. The influence of both the annealing temperature and the Cu content on the magnetic properties was investigated by SQUID magnetometry and an uniaxial perpendicular magnetic anisotropy of up to 2 MJ/m³ has been achieved. The magnetic analysis was complemented by MFM revealing the local magnetic domain configuration. Detailed structural investigations by XRD confirm the pronounced (001) texture and the existence of a high degree of L1₀-type long range order. In addition, the topography has been further investigated by SEM and AFM confirming that annealing to temperatures T > 600^∘C leads to a distinct dewetting behavior of these thin films and the formation of small FePtCu grains. This phenomena correlates with a pronounced increase in coercivity.

This work was supported by the European project TERAMAGSTOR (contract No. ICT-224001).