Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnetic Particles and Clusters I
MA 31.11: Vortrag
Donnerstag, 26. März 2009, 12:45–13:00, HSZ 401
Growth and magnetism of ordered alloy nanostructures — •yasmine nahas1,2, vincent repain1, and sylvie rousset1 — 1Laboratory Material and Quantum Phenomena, University Paris 7, UMR 7162, 10 rue Alice Domon et Léonie Duquet, 75205 Paris, France — 2Physikalisches Institut, Universität Karlsruhe (TH), Wolfgang-Gaede-Str., D-76131, Karlsruhe, Germany
Nanomagnetism is a growing field of interest both from technological and fundamental motivations. Ordered growth allows to obtain structures with a controlled size and density [1], so enables the use of averaging technique to study magnetic properties of nanostructures. I will present two original systems of ordered magnetic nanostructures on gold surfaces. The first one deals with ordered alloy nanostructures of Fe-Pt, the second deals with core-shell nanostructures of Co-Au. Fe-Pt alloy nanodots well caracterized, regular in size, and ordered, were obtained. Systems with various concentrations of magnetic atoms can be elaborated. Moreover, magnetic measurements on Co-Au system were done with a good knowledge of the structure at the atomic scale. An increase of the magnetic anisotropy energy is observed for a given gold coverage. To interpret magnetic measurements on these systems of nanostructures of alloy, importants effects have to be taken into account, beyond the morphology : the atomic structure first, and an other effect very important even for simple structures : the relaxations.
[1] V. Repain et al., J. Phys.: Condens. Matter. 18 (2006) S17-S28