Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.54: Poster

Thursday, March 19, 2020, 15:00–18:00, P3

Transport of magnetic particles by custom-made magnetic pulse sequenceswith varied alteration rates — •Nikolai Weidt, Meike Reginka, and Ehresmann Arno — Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

In order to design microfluidic analysis devices, a controlled and directed transport of particles is needed. The transport of superparamagnetic particles above magnetically stripe-patterned exchange bias layer systems with head-to-head and tail-to-tail orientation of the magnetization in adjacent stripe domains vertical to the long stripe axis, manufactured by ion bombardment induced magnetic patterning, is a promising approach to achieve this remote-controlled and directed transport. The superparamagnetic particles are transported by periodically transforming the magnetic field landscape above the layer system with an external magnetic field [1]. Microfluidic experiments revealed influences of the alteration rate of the applied magnetic field sequences on the particle velocities. It was observed that the particles’ trajectories vary with the shape of these trapezoidal magnetic field pulses, concluding in a smoother movement of the particles for smaller alteration rates. These findings are supported by trajectories from simulations based on the consideration of the surface and magnetic forces acting on a particle. [1] D. Holzinger, I. Koch, S. Burgard, and A.Ehresmann, ACS Nano 9, 7323 (2015)