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MA: Magnetismus

MA 6: Magnetische Partikel / Cluster

MA 6.3: Vortrag

Montag, 8. März 2004, 15:45–16:00, H10

Electronic and Magnetic Properties of Ligand-Free FePt Nanoparticles — •H.-G. Boyen¹, K. Fauth², B. Stahl³, P. Ziemann¹, G. Kästle¹, F. Weigl¹, F. Banhart⁴, M. Heßler², G. Schütz³, N.S. Gajbhiye⁵, J. Ellrich⁶, H. Hahn⁶, M. Büttner⁷, M.G. Garnier⁷, and P. Oelhafen⁷ — ¹Abteilung Festkörperphysik, Universität Ulm, D-89069 Ulm — ²Experimentelle Physik IV, Universität Würzburg, Am Hubland, D-97074 Würzburg — ³MPI für Metallforschung, Heisenbergstraße 1, D-70689 Stuttgart — ⁴Zentrale Einrichtung Elektronenmikroskopie, Universität Ulm, D-89069 Ulm — ⁵Institut für Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe — ⁶Fachbereich Material- und Geowissenschaften, Petersenstr. 23, TU Darmstadt, D-64287 Darmstadt — ⁷Institut für Physik, Universität Basel, Klingelbergstr. 82, CH-4056 Basel

Ordered arrays of well separated and atomically pure FePt nanoparticles (diameter 3.7 nm) have been prepared under UHV conditions by employing a combination of oxygen/hydrogen plasmas allowing to completely remove the organic ligands which are present after particle synthesis. The plasma treatments conserve, however, the order of the particle arrangement. This enables us to investigate, for the first time, the electronic structure and the magnetic properties of bare, ligand-free fcc FePt particles by means of X-ray induced photoelectron spectroscopy (XPS) and X-ray Magnetic Circular Dichroism (XMCD), respectively. First results about the electronic density of states and the magnetic behavior of the nanoparticle array will be presented.