SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.2: Poster

Friday, October 1, 2021, 10:00–13:00, P

Exploring the dynamical behaviour of spherical exchange-biased Janus particles as a new tool for microfluidic biointeraction screening — •Rico Huhnstock, Claudia Jauregui Caballero, Meike Reginka, Michael Vogel, and Arno Ehresmann — Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

Janus particles (JPs) with engineered magnetic properties show significant potential for controlled motion in fluids by external dynamic magnetic fields [1]. In this work, we introduce an exchange bias (EB) thin film system on spherical non-magnetic particles as functionalized JPs and investigate their motion behaviour when being manipulated by dynamically varying artificial magnetic field landscapes above a topographically flat substrate. Due to the EB an Onion magnetization texture is stabilized within the magnetic cap of the JP [2], which is usually not accessible for micron-sized particles and allows for comparably high transport velocities. Probing the dynamics of the JPs in a microfluidic environment resulted in a superposition of controlled translational and rotational movements, emphasizing their potential use for biomolecular interaction analysis. This holds true not only for one-dimensional, but also two-dimensional translational motion. In addition, we highlight experimental possibilities to address and seperate each motion domain (translation and rotation) individually.

[1] Baraban et al. (2012), ACS Nano, 6(4):3383-3389.

[2] Tomita et al. (2021), J. Appl. Phys., 129:015305.