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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.88: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Mass-filtered ferromagnetic alloy clusters on surfaces — •M. Getzlaff1, R.K. Gebhardt1, F. Bulut1, D. Schmitz2, E. Holub-Krappe2, H. Maletta2, A. Kleibert3, R.-P. Methling3, J. Bansmann3, and K.-H. Meiwes-Broer3 — 1Institut für Angewandte Physik, Uni Düsseldorf — 2HMI Berlin — 3Fachbereich Physik, Uni Rostock
Clusters with their enlarged magnetic moments are promising materials for ferromagnetic thin film devices. Fe and FeCo clusters with diameters of 6...12 nm were prepared in a new developed, continuously working arc cluster ion source (ACIS) and subsequently mass filtered by means of an electrostatic quadrupole deflector. The clusters were deposited on ferromagnetic (Ni/W(110), Co/W(110)) and nonmagnetic surfaces (W(110), Si(001)). AFM measurements prove a height being smaller than the diameter for free particles which can be explained by particle-support interaction. HRTEM measurements confirm that the stoichiometry in deposited FeCo clusters is very similar to the chosen bulk material. Magnetic properties were determined by X-ray magnetic circular dichroism (XMCD) with specificity to different elements at BESSY. We observed very large total magnetic moments of both Fe and Co when compared to their resp. bulk properties. Analogously to pure clusters in this size regime, the orbital moments ml in FeCo alloy clusters on Ni(111) are significantly enhanced with respect to bulk material. Thus, ml of FeCo clusters play the dominant role for reaching total magnetic moments above the known bulk value although their contributions are about one order of magnitude smaller than the spin moments ms.