Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Bulk Magnetic Materials and Magnetic Particles/Clusters
MA 7.10: Vortrag
Montag, 18. März 2024, 12:00–12:15, EB 407
Studying the influence of magnetic stripe domain size on the magnetophoretic transport of superparamagnetic beads for their controlled spatial fractionation — •Rico Huhnstock1, Lukas Paetzold1, Piotr Kuświk2, 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 — 2Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, Poznań 60-179, Poland
Directed transport of magnetic particles for Lab-on-a-chip applications can be realized by superposing periodic magnetic stray field landscapes, emerging from tailored magnetic domain patterns, with external time-dependent magnetic fields [1]. A transition from a linear (phase-locked) to a non-linear (phase-slipping) motion behavior is typically observed for a critical frequency of the external field [2]. This critical frequency is a function of particle and domain pattern characteristics. Studying the latter influence is the scope of this work: We fabricated magnetic stripe domains of gradually increasing width within the same substrate and explored the motion dynamics of laterally transported superparamagnetic beads on top using an optical microscope. As a result, we observed position-dependent critical frequencies, which we will highlight to be beneficial for the spatial fractionation of beads with different magnetophoretic mobilities.
[1] Holzinger et al. (2015), ACS Nano, 9(7):7323.
[2] Yellen et al. (2007), Lab on a Chip, 7(12):1681.
Keywords: Ion bombardment induced magnetic patterning; Superparamagnetic beads; Magnetic particle transport; Microfluidics; Exchange bias thin films