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MA: Fachverband Magnetismus

MA 23: Micro- and Nanostructured Magnetic Materials III

MA 23.4: Vortrag

Donnerstag, 25. März 2010, 11:00–11:15, H3

Temperature dependence of the magnetic properties of L1₀-FePt nanostructures — •Thomas Bublat, Achim Breitling, and Dagmar Goll — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany

L1₀-FePt/Fe composite media are one of the most promising candidates for solving the writeability/thermal stability/signal-to-noise ratio trilemma of next generation high-density magnetic storage media. The hard magnetic component guarantees thermal stability for smallest dot sizes whereas the soft magnetic component reduces the coercivity and thus enables writeability with conventional write heads. To get a deeper understanding of the hard magnetic L1₀-FePt part the magnetic properties of L1₀-FePt nanoislands obtained by cosputtering Fe and Pt at elevated temperatures for thicknesses less than 20 nm have been measured as a function of the temperature from 40 K up to the Curie temperature. The smallest dot sizes of the L1₀-FePt nanostructures studied were found to be 15 nm. Furthermore by nanoimprint lithography (NIL) large area (2 x 2 mm²) nanopatterns with a regular arrangement of nanodots (dot sizes 40 - 100 nm) have been produced and characterized.