Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.26: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Magnetic patterning of TMR thin film systems for controlled movement and detection of superparamagnetic beads — •Rico Huhnstock1, Andreas Becker2, Jendrik Gördes1, Maximilian Merkel1, Dennis Holzinger1, Arno Ehresmann1, and Andreas Hütten2 — 1Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Thin Films and Nanostructures, Department of Physics, Bielefeld University, P.O. Box 100131, D-33501 Bielefeld
Designing point-of-care diagnostic devices using magnetic particles as labels for disease specific biomolecules, an obstacle presents itself in directing the particles towards a highly sensitive detection area [1]. As a solution, we propose the novel combination of a magnetically patterned exchange bias thin film system for initialising particle movement with magnetic tunnel junction based sensor elements. In this work we demonstrate the successful fabrication of such hybrid systems by means of keV-He ion bombardment and verify the induced magnetic domain pattern. It is shown, that the magnetoresistance of the sensor elements is unharmed by the bombardment process and thus enables a detection of delivered magnetic particles. Finally the experimental realization of a directed particle transport above the hybrid system in a microfluidic environment proves the potential application of the here presented system within biomedicine.
[1] Weddemann et al. (2010), Biosensors and Bioelectronics, 26: 1152-1163.