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O: Fachverband Oberflächenphysik

O 69: Poster: Spin Phenomena in Chiral Molecular Systems

O 69.3: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Pinning of magnetic domains and skyrmions by adsorption of chiral polypeptides — Yael Kapon¹, •Theo Balland², Fabian Kammerbauer², Mathias Kläui², Shira Yochelis¹, Mathias Kläui², and Yossi Paltiel¹ — ¹Institute of Applied Physics, Faculty of Sciences, The Hebrew University of Jerusalem,Jerusalem 9190401, Israel — ²Institute of Physics, Johannes Gutenberg University, Staudingerweg 7, 55128 Mainz, Germany

Spin currents are of intrinsic interest to the magnetism community due to its ability to influence magnetic states. A high degree of spin polarization can be achieved by chirality-induced spin selectivity (CISS) [1]. Here we investigate the impact of adsorbed chiral polypeptides on the pinning of magnetic domains [2]. The examined structure comprises chiral polypeptide α-helix polyalanine adsorbed on a Ta(5)/CoFeB(0.9)/MgO(2)/Ta(2)/Au(5) thin film, exhibiting perpendicular magnetic anisotropy, along with a Ti(2)/Ni(80)/Au(5) thin film. Utilizing Magneto-Optic Kerr Effect microscopy, the magnetic structures are visualized, and the surface magnetization is quantified. Magnetic imaging of domain walls unveils distinctions between chiral and achiral molecules adsorbed on the surface. Comparative analysis of the in-plane magnetization curves of Ti/Ni/Au/chiral molecules enables the observation of the rotation of the easy axis of magnetization. This rotation is attributed to the alignment of magnetization with the spatial orientation (tilt angle) of the molecules [2].

[1] R. Naaman et al., Nat. Rev. Chem. 3, 250-260 (2019)

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

Keywords: MOKE; CISS