Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnetic Particles and Clusters I
MA 31.2: Vortrag
Donnerstag, 26. März 2009, 10:30–10:45, HSZ 401
Size-selected supported ferromagnetic clusters: correlation of structural and magnetic properties — •Wolfgang Rosellen1, Furkan Bulut1,2, Christian Kleinhans1, R. Kerstin Gebhardt1, Joachim Bansmann2, Armin Kleibert3,4, Karl-Heinz Meiwes-Broer3, and Mathias Getzlaff1 — 1Institute of Applied Physics, University Düsseldorf — 2Dep. of Surface Chemistry, University Ulm — 3Institut of Physics, University Rostock — 4now Paul Scherrer Institute, Switzerland
The bulk and thin film behaviour of softmagnetic materials have extensively been studied in the past. Concerning the increase of density in magnetic data storge systems magnetic clusters become interesting because of their particular size dependence of electronic and magnetic properties. We report on the magnetic properties of size-selected clusters, deposited on bare W(110) and on a thin Ni(111)/W(110) film system, by the element specific XMCD spectroscopy allowing the determination of spin and orbital moments. The crystalline nanoparticles consist of pure Fe and Co as well as an FeCo alloy and exhibit tunable diameters between 5-15 nm. The clusters are produced using an UHV compatible gas aggregation source avoiding any oxidation. Mass separation is carried out by a subsequent electrostatic quadrupole. The shape after deposition was investigated in situ by STM and compared with the lateral size being determined by HRTEM. This enables a direct correlation of structural and magnetic properties in combination with the XMCD measurements.