Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Poster I
MA 10.66: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
MOKE investigation of ferromagnetic nanoparticles deposited on a W(110) surface — •Christian Kleinhans1, Wolfgang Rosellen1, Volker Hückelkamp1, Furkan Bulut1,2, Joachim Bansmann2, Armin Kleibert3, and Mathias Getzlaff1 — 1Institute of Applied Physics, University of Düsseldorf, Germany — 2Department of Surface Chemistry, Ulm University, Germany — 3Swiss Light Source at the Paul Scherrer Institute, Villigen, Switzerland
Magnetic properties of supported 3d-metal nanoparticles, differing from the behaviour of bulk material, open the possibility of applications from a technological point of view. With a continuously working, UHV-compatible arc cluster ion source (ACIS), ferromagnetic nanoparticles have been produced and subsequently mass filtered using an electrostatic quadrupole-deflector-unit, ensuring sizes of 5 to 15 nm. The deposition of these preformed free particles onto a W(110)-substrate is performed under soft-landing conditions. Their size and shape is determined by means of STM and TEM. Applying a magnetic field in plane of the sample with variable angle, the magnetic behaviour of the nanoparticles is characterised using magneto-optical Kerr effect (MOKE). The influence of the angle and strength of the magnetic field on the magnetization is used to determine the nanoparticles' magnetic anisotropy and correlate this characteristic property with the respective structural behaviour.