Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.87: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Fabrication and Magnetic characterization of exchange-biased Janus Particles — •Meike Reginka1, Andreea Tomita1, Rico Huhnstock1, Thomas Kusserow1, Kai Arstila2, Dennis Holzinger1, and Arno Ehresmann1 — 1Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Department of Physics, University of Jyväskylä, Suorvontie 9, FI-40014 Jyväskylä
Research in the field of point-of-care technology requires bio-functionalized particles, that allow for remotely controllable actuation in microfluidic processes, e.g. via external magnetic fields. In order to magnetically address the particles' degrees of motion, an exchange bias layer system was introduced on top of silica microspheres resulting in magnetic Janus particles. The sputter-deposited exchange bias system exhibits an unidirectional anisotropy, and thus, giving rise to a pinned magnetization distribution within the spherical half shell. For experimental verification the magnetic properties of the designed particles were investigated by Magnetic Force Microscopy and Kerr magnetometry besides other imaging methods on the nanometer scale, namely Helium Ion Microscopy, Focused Ion Beam and Scanning Electron Microscopy. Additionally, the addressability of the particles is shown in dynamic microfluidic experiments under externally applied rotational magnetic fields.