Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 29: Skyrmions II

MA 29.10: Talk

Wednesday, March 19, 2025, 17:30–17:45, H20

Effects of chiral polypeptides on skyrmion stability and skyrmion diffusion — Fabian Kammerbauer¹, Yael Kapon², •Theo Balland¹, Shira Yochelis², Sachin Krishnia¹, Yossi Paltiel², and Mathias Kläui¹ — ¹Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz, Germany — ²Institute of Applied Physics, Faculty of Sciences, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel

CISS, chirality-induced spin selectivity is a phenomenon that has raised significant interest due to the large spin polarizations generated by organic molecules and other effects such as magnetic switching of ferromagnets induced by chiral molecules [1]. In hybrid systems, these chiral molecules have been observed to influence magnetic properties such as changes in the magnetization [2]. In this study, we investigate how chiral molecules of α-helix polyalanine interact with chiral spin structures, namely magnetic skyrmions, which are stabilized in ferromagnetic/heavy metal multilayers due to Dzyaloshinskii-Moriya interaction [3]. Using magneto-optic Kerr effect imaging, we show that chiral polypeptides can influence the stability of skyrmions by modifying the ranges of temperature and applied magnetic field in which they are stable. We also show that the chiral molecules affect the skyrmion dynamics, in particular the thermal diffusion of the skyrmions [4].

[1] R. Naaman et al. Nat. Rev. Chem. 3, 250 (2019)

[2] Y. Kapon et al. J. Chem. Phys. 159, 064701 (2023)

[3] K. Everschor-Sitte et al. J. Appl. Phys. 124, 240901 (2018)

[4] Y. Kapon et al. (under review)

Keywords: CISS; Skyrmion; MOKE