Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Magnetic Thin Films II
MA 20.9: Vortrag
Mittwoch, 28. März 2007, 17:15–17:30, H5
Electronic structure of chemically disordered FePt films — •Hans-Gerd Boyen1, Sven Bornemann2, Ulf Wiedwald1, Anitha Ethirajan1, Gerd Kästle1, Paul Ziemann1, Jan-Ulrich Thiele3, David Bachelor4, Kai Fauth5, Jan Minar2, Hubert Ebert2, Andriy Romanyuk6, and Peter oelhafen6 — 1Institut für Festkörperphysik, Univ. Ulm — 2Abteilung Physikalische Chemie, LMU München — 3Hitachi Global Storage Technologies, San Jose Research Center, San Jose — 4BESSY GmbH, Berlin — 5MPI für Metallforschung, Stuttgart — 6Institut für Physik, Univ. Basel
FePt nanoparticles deposited as two-dimensional arrays on top of suitable substrates are currently in the focus of interest because they offer the potential to be used as ultra-high density data storage media in magnetic recording applications. In order to better understand the electronic properties and, finally, the resulting complex magnetic behaviour of such nanoscaled systems, corresponding bulk alloys have been prepared as reference systems in the chemically disordered state allowing to systematically analyze their electronic structure over a wide range of compositions. Synchrotron radiation induced photoemission (photon energy 180-900eV) is used as a tool to access the element-specific densities of states within the different alloys. Experimental valence-band spectra will be compared to theoretical spectra predicted for the various photon energies and alloy compositions on the basis of band structure calculations performed within the framework of a scalar-relativistic Korringa-Kohn-Rostocker approach using the Coherent Phase Approximation.