Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and Nanostructured Magnetic Materials I
MA 39.5: Vortrag
Donnerstag, 29. März 2012, 10:30–10:45, EB 202
Directed self-assembly of (sub-)phthalocyanine submonolayers by magnetic stray field landscapes — •Florian Ahrend1, Ulrich Glebe1, Tobias Weidner2, Ulrich Siemeling1, and Arno Ehresmann1 — 1Department of Physics and Chemistry, CINSaT, University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Department of Bioengineering, University of Washington, Seattle
Magnetic stray field landscapes are produced by ion bombardment induced magnetic patterning (IBMP) of exchange-biased magnetic bilayers (A. Ehresmann, Recent Res. Devel. Applied Phys., 7 (2004)) into artificial parallel-stripe magnetic domains. The µm-sized magnetic stripe patterns with antiparallel magnetizations in adjacent domains (head-to-head/tail-to-tail) lead to strong magnetic stray fields above the domain walls. It will be shown that these stray fields influence the self-assembly of submonolayers of chemically modified (sub-)phthalocyanines. Diamagnetic derivatives of these molecules are shown to assemble preferentially in areas offering low magnetic stray field gradients. Characterization of the samples has been performed by X-ray photoelectron emission microscopy (X-PEEM), time-of-flight secondary ion mass spectroscopy (ToF-SIMS) and near-edge x-ray absorption fine structure imaging (NEXAFS-imaging) measurements.