Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 15: Thin magnetic films

DS 15.1: Hauptvortrag

Mittwoch, 29. März 2006, 15:30–16:15, GER 38

Nanoparticulate films of high anisotropy magnetic materials: A status quo — •Bernd Rellinghaus — IFW Dresden, P.O. Box 270116, D-01171 Dresden

In recent years, attempts to push the areal storage density of materials for single-grain-per-bit hard disk media towards their physical (superparamagnetic) limits have gained significant attention. However, a breakthrough in preparing films of high anisotropy L1₀-FePt nanoparticles for this purpose is yet to be awaited. The talk reviews the advantages and shortcomings of both, colloidal and gas phase preparation routes – the two most wide-spread approaches in the field. Whereas wet-chemical preparation allows for precise size control and periodic particle arrangement on a substrate, the simultaneous provision of high magnetic anisotropy and texture seems problematic. Advantageous to the gas phase preparation is the possibility to thermally anneal such particles prior to their deposition on a substrate. This in principle allows to disentangle inter- and intra-particle sintering processes from the L1₀-ordering. The dependence of the degree of L1₀ order in FePt nanoparticles on the local environment, particle size, time, and temperature will be reported. Potential measures to overcome the present obstacles by interdisciplinarily combining different methods will be given as an outlook.