Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Micro- and Nanostructured Magnetic Materials I

MA 20.2: Vortrag

Mittwoch, 25. März 2009, 13:00–13:15, HSZ 403

Magnetic properties of exchange-coupled L1₀-FePt/Fe nanostructures — •Achim Breitling, Thomas Bublat, and Dagmar Goll — MPI für Metallforschung, Stuttgart, Germany

Nanopatterned L1₀-FePt/Fe composite media with perpendicular magnetization are considered to be one of the most straightforward concepts to achieve ultrahigh storage densities in magnetic recording. The hard magnetic component L1₀-FePt guarantees thermal stability for smallest dot sizes whereas the soft magnetic component Fe reduces the coercivity and thus enables conventional write heads to store information in such patterns.

To optimize the L1₀-FePt/Fe nanopatterns the influence of the microstructure and of the composition on the magnetic properties of the L1₀-FePt part has been studied systematically within the ferromagnetic temperature range. Furthermore a technique has been developed to manipulate the character of the L1₀-FePt/Fe interface resulting in a gradual change of the material parameters. The nanostructures have been fabricated by advanced lithography methods and by annealing at elevated temperatures.