Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.18: Poster

Donnerstag, 20. März 2025, 15:00–17:30, P3

Estimation of the exchange stiffness constant via domain wall widths using magnetic bilayers — •Florian Gossing, Michael Vogel, Dennis Seidler, and Jeffrey McCord — Nanoscale Magnetic Materials, Department of Materials Science, Kiel University, Kaiserstraße 2, 24143 Kiel, Germany

The exchange stiffness constant is a key parameter influencing the energy of (micro)magnetic systems. Magnetooptical measurements on compensating Néel walls of a FeCoSiB double layer structure are performed to determine the exchange stiffness constant. Parasitic magnetooptical effects such as the unavoidable magnetooptical gradient effect are removed by evaluating neighboring domain wall pairs of equal chirality. Corresponding modeled domain wall widths are compared with the experimentally determined widths, taking into account also the thickness dependent magnetooptical sensitivity function. Thus, the integral domain wall widths allow for an estimation of the exchange stiffness constant. The methodology is readily applicable to various thin film magnetic materials. The estimated exchange stiffness constants are compared with those obtained from ferromagnetic resonance measurements.

Keywords: Exchange stiffness constant; MOKE microscopy; Domain wall widths; Micromagnetic simulations; Compensating Néel walls