Berlin 2008 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Poster: Trends in Ion Beam Technology, Magnetism in Thin Films, Functional Oxides, High-k Dielectric Materials, Semiconductor Nanophotonics, Nanoengineered Thin Films, Layer Deposition Processes, Layer Growth, Layer Properties, Thin Film Characterisation, Metal and Amorphous Layers, Application of Thin Films
DS 17.47: Poster
Tuesday, February 26, 2008, 09:30–13:30, Poster A
Magnetic properties and exchange bias effects in nanocluster assembled films of equiatomic Fe-X (X=Pd, Pt, and Au) synthesized by inert gas phase condensation — Chandrahas Bansal1,2, •Ajay Kumar Mishra1, and Horst Hahn1 — 1Institute for Nanotechnology, Forschungszentrum Karlsruhe, Karlsruhe 76021, Germany — 2University of Hyderabad, Hyderabad 500 046, India
Nanocluster assembled films of equiatomic Fe-Pd, Fe-Pt, and Fe-Au alloys were synthesized using a UHV nanocluster film deposition system (model NANODEP60 from Oxford Applied Research, UK). The films were nanoporous and consisted of agglomerates of small size nanoclusters of diameters 4 to 5 nanometers. The M(T) data in zero-field-cooled (ZFC) and field-cooled (FC) states revealed a blocking temperature of 33 K, 35K, and 41K for the Fe-Pt, Fe-Pd, and Fe-Au cluster films. Besides this, there was a paramagnetic response at lower temperatures both in the ZFC and FC states showing that there was a partial oxidation of the clusters even in the as-prepared films although they were deposited at base pressures of 10-8 torr. The defect states in the oxide shell gave rise to these moments that remained uncoupled to the antiferromagnetic lattice. A exchange bias of about 1 KOe was observed in all the three alloys with the lowest value for Fe-Au and the highest value for Fe-Pd cluster films.