Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.75: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Strayfield landscape supported self-assembling sub-monolayers of phthalocyanines — •Florian Ahrend1, Ulrich Glebe1, Tobias Weidner2, Ulrich Siemeling1, and Arno Ehresmann1 — 1University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Department of Bioengineering, University of Washington, Seattle
Ion bombardment induced magnetic patterning (IBMP) modifies exchange bias layer systems into defined artificial domain patterns of different shape and size. These can be used to control the self-assembly of certain organic compounds into well ordered sub-monolayers. In this experiment topographically flat samples with a magnetic stripe pattern of a periodicity of 10 or 20 micrometer are used. A head-to-head/tail-to-tail magnetization was chosen, so that at each border of adjacent domains strong magnetic strayfields occur above the sample surface. The used organic molecules are derivatives of phthalocyanines, which possess a permanent magnetic moment and should be sensitive to external magnetic strayfields. Because of the planar shape of the phthalocyanines and their aromatic structure, they have the capacity to build self-assembled monolayers. In our case we want to inhibit a developing of a complete monolayer and want to navigate the molecules to chosen areas (i.e. on the domain walls or the domains themselves). To identify the possible alignment of the molecules along the borders of the magnetic domains several techniques were used. For example spectroscopic techniques like scanning ToF-SIMS, NEXAFS and XPEEM.