Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 65: Poster 2
MA 65.1: Poster
Friday, March 24, 2017, 09:30–13:00, P2-OG1
Behavior of silica-based magneto-optical fluids influenced by dynamically changing magnetic stray field landscapes — •Iris Koch1, Karl Sebastian Mandel2, Tim Granath2, 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 — 2Fraunhofer Institute for Silicate Research ISC, Neunerplatz 2, D-97082 Würzburg
The microscopic motion of silica-based superparamagnetic rods (SR) in aqueous solution and their resulting macroscopic magneto-optical behavior were manipulated by using specially designed magnetic field landscapes (MFL). These MFL originate from a superposition of magnetic stray fields emerging from micromagnetically stripe-patterned exchange bias (EB) bilayer systems [1] and time-dependent external magnetic fields. The SR were found to arrange in parallel rows above the respective domain walls emerging from the EB substrate's surface. By applying defined external magnetic field pulses, the orientation and localization of these rows can be varied and, thereby, cause significant changes of the macroscopical optical properties of the fluid. The obtained results are promising for the future development of remotely switchable optical filter systems.
[1] D. Holzinger et al., J. Appl. Phys. 114, 1 (2013)