Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 59: Complex Fluids and Colloids, Micelles and Vesicles (joint session CPP/DY)

CPP 59.4: Vortrag

Mittwoch, 18. März 2020, 10:15–10:30, ZEU 114

Dynamic Self-assembly of Magnetic Janus Particles — •Sofia Kantorovich1,2, Pedro Sanchez1,2, Maximilian Neumann3, Sibylle Gemming3,4, and Artur Erbe31University of Vienna, Vienna, Austria — 2Ural Federal University, Ekaterinburg, Russia — 3Helmholtz-Zentrum Dresden-Rossendorf, Rosendorf, Germany — 4Technische Universität Chemnitz, Chemnitz, Germany

In this contribution we explain how the interplay between hydrodynamics, magnetic interactions and the frequency of an applied magnetic field affect the structure and the size of clusters formed by magnetic Janus particles. We study silica particles (radius of 2.27μm) with a magnetic thin film coating (of a multilayer stack of Ta(3.0 nm)/Pd(3.0 nm)/[Co(0.28 nm)/Pd(0.9 nm)]8/Pd (1.1 nm)) on one hemisphere. Such a layer exhibits perpendicular magnetic anisotropy, i.e., the magnetic flux points out of the film plane [1]. Our previous combined experimental-simulation study showed that if the monolayer of such Janus particles is exposed to a low-frequency magnetic field, one can efficiently control self-assembly letting branched clusters of staggered chains, compact clusters, linear chains, and dispersed single particles to form and reconvert reversibly [2]. In the present contribution, we extend our investigation to high frequency out-of-equilibrium transformations.

[1] M. Albrecht et al., Nat. Mater. 4, 203 (2005). [2] Steinbach et al., PRE 100, 012608 (2019).

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