Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.42: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Magnetically Patterned Rolled-Up Exchange Bias Tubes: A Paternoster for Superparamagnetic Beads — •Timo Ueltzhöffer1, Robert Streubel2, Iris Koch1, Dennis Holzinger1, Denys Makarov2, Oliver G. Schmidt2, and Arno Ehresmann1 — 1Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel (Germany) — 2Institute for Integrative Nanosciences, Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Helmholtzstraße 20, 01069 Dresden (Germany)
A deterministic transport system for superparamagnetic microbeads through magnetically designed tubular microchannels was realized. The beads are transported in a stepwise manner exhibiting paternoster-like trajectories as they are moved through the tube and back on top of it. The transport could be controlled by a series of weak magnetic field pulses and takes advantage of the magnetic stray field that emerge from the patterned microtubes. In order to fabricate such microtubes, strain engineered layers were covered by an exchange bias system, patterned by light ion bombardment on parallel stripes and subsequently rolled up. This approach impacts several fields of 3D applications in biotechnology, including particle transport related phenomena in lab-on-a-chip and lab-in-a-tube devices.
[1] Ueltzhöffer, T. et al. Magnetically Patterned Rolled-Up Exchange Bias Tubes: A Paternoster for Superparamagnetic Beads. ACS Nano 10, 8491-8498 (2016).