Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetic Particles and Clusters II
MA 36.2: Vortrag
Donnerstag, 26. März 2009, 15:30–15:45, HSZ 401
Imaging magnetic responses of different Fe nanocube configurations — •Nina Friedenberger1, Katharina Ollefs1, Florian Kronast2, Hermann Dürr2, and Michael Farle1 — 1Experimentalphysik-AG Farle, Fachbereich Physik, Universität Duisburg-Essen, Germany — 2BESSY GmbH, Berlin, Germany
While structural properties of self-assembled particles can be studied using electron microscopy, a magnetic characterization is presently mostly based on ensemble averaging. Here we use high lateral resolution photoemission electron microscopy (PEEM) and x-ray magnetic circular dichroism (XMCD) spectroscopy to overcome this limitation. We studied Fe nanoparticles with a cubic shape [1] in the PEEM with a lateral resolution of typically 30nm. In order to identify the local coordination of the particles we matched the PEEM images to scanning electron microscopy (SEM) images of higher lateral resolution. PEEM images were taken in an applied magnetic field of up to +/-33mT which allowed us to extract the hysteresis behavior of different configurations at temperatures down to 110K. Our results demonstrate that the magnetic properties of the investigated Fe nanoparticles depend strongly on their local coordination. Obviously strong magnetic dipolar coupling between neighboring particles influences their magnetic response. Financially supported by: DFG (SFB 445) and EC: MC-RTN "SyntOrbMag". [1] A. Shavel, et al. Adv. Funct. Mat. 17 (2007) 3870-3876