Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Magnetic Particles, Clusters
MA 9.8: Vortrag
Montag, 22. März 2010, 17:00–17:15, H23
Magnetic nanoparticle arrays in 2-D and 3-D investigated with specular and diffuse X-ray scattering — •Durga Mishra1, Maria Jose Benitez1,2, Oleg Petracic1, Frank Brüssing1, Philipp Szary1, Giovanni Badini Confalonieri1, Matthias Feyen2, Anhui Lu2, Leonardo Agudo3, Günther Eggeler3, and Hartmut Zabel1 — 1Experimental Physik IV, Ruhr Universität Bochum, D-44780 Bochum — 2Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim an der Ruhr — 3Institute for Materials, Department of Materials Science, D-44780 Bochum
Magnetic (single domain) nanoparticles show promising potential for future nanotechnology applications. The novel applications manifest itself depending on the size and shape distribution of the nanoparticles which in turn affects the arrangement in 2-D or 3-D lattice structure. We report here the X-ray investigation of continuous array of 20nm diameter Iron Oxide nanoparticles spin coated on Si substrate (monolayer and multilayer). The in-plane hexagonal ordering and the out of plane superlattice structure were investigated with GISAXS and X-ray reflectivity measurements. A Grazing Incidence Diffraction (GID) study shows a mixed phase of iron oxide with different crystal structures (fcc and inverse spinel) due to annealing. The Zero Field Cooling (ZFC) and Field Cooling (FC) magnetization curves support the X-ray observation and show an exchange bias effect due to a core/shell structure, which was confirmed by TEM dark field imaging. This paves a way for tuning the magnetic and electronic properties without changing the ordering of the self organization.