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MA: Fachverband Magnetismus

MA 7: Bulk Magnetic Materials and Magnetic Particles/Clusters

MA 7.9: Vortrag

Montag, 18. März 2024, 11:45–12:00, EB 407

Application of white light interferometry for the absolute equilibrium height quantification of magnetic microbeads captured by tailored magnetic stray fields above a topographically flat surface — •Yahya Shubbak¹, André Stelter², Nikolai Weidt¹, Marco Künne², Rico Huhnstock¹, Peter Lehmann², and Arno Ehresmann¹ — ¹Institute of Physics & Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, D-34132 Kassel — ²Institute of Measurement Technology, University of Kassel, D-34121 Kassel

Precise control of magnetic micro- and nanoparticles (MPs) in microfluidic environments allows for novel investigations in biomolecular analyte detection and interactions [1]. Utilizing static magnetic field landscapes from a magnetically patterned substrate, combined with external magnetic field pulses, facilitates translatory motion control of MPs at the micro-scale [2]. The close-to-substrate motion of MPs is sensitive to liquid-mediated particle-substrate interactions [3]. Monitoring changes in these interactions by measuring the equilibrium height of MPs above the substrate surface offers a promising approach for sensitive analyte detection. As a crucial step, we introduce white light interferometry to quantitatively measure the absolute distance between MPs and the underlying magnetic substrate. [1]Lim et al., J. Phys. D: Appl. Phys. 50, 33002 (2017) [2]Holzinger et al., Appl. Phys. Lett. 100, 153504 (2012) [3]Huhnstock et al., Sci Rep 12, 20890 (2022)

Keywords: Light interferometry; Absolute hight measurements; Magnetic Substrates; Particle Transport; white light interferometry