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MA: Fachverband Magnetismus

MA 36: Molecular Magnetism and Magnetic Particles / Clusters I

MA 36.5: Vortrag

Mittwoch, 11. März 2026, 16:00–16:15, POT/0151

Magnetic cuboidal particles as field sensors for microscaled magnetic stray field landscapes — •Jonas Bugase, Christian Janzen, Arne Vereijken, Yahya Shubbak, Nikolai Weidt, Rico Huhnstock, and Arno Ehresmann — Institute of Physics , University of Kassel, 34132 Kassel

Recently, magnetic domain patterns engineered in thin-film systems have been widely used in data storage, spintronics, and magnetic imaging. Characterizing the micron-scale magnetic stray fields emerging from these patterns remains a topical but challenging task [1]. We present a non-mechanical, optically trackable method to visualize effective magnetic field directions using anisotropically shaped magnetic particles. These particles are fabricated via 2-photon polymerization lithography and magnetic exchange-biased layer deposition to achieve custom shapes and anisotropies. When positioned in the field landscape of a periodically patterned substrate [2] within a quiescent liquid, the particles spontaneously orient and reorient in response to local micron-scale stray fields. This enables efficient characterization of complex magnetic domain patterns. We further explore probing local field variations with superimposed external fields facilitating diagnostic and biomedical microfluidic applications [3].

[1] Nistico et al. (2020), Inorganics, 8(1):6.

[2] Holzinger et al. (2013), J. Appl. Phys, (114): 013908.

[3] Ehresmann et al. (2015), Sensors, (15): 28854.

Keywords: Magnetic particles; Ion bombardment Induced Patterning (IBMP),; Magnetic Field Landscapes; Lab-on-Chip devices; 2-Photon Polymerization Lithography (2PP)