The adsorption of chiral molecules was recently shown to trigger a change in the magnetisation of mesoscopic magnetic domains in a ferromagnetic underlayer. In this work, we investigated the macroscopic (magneto-)optical response of chemisorbed α-helical polyalanine self-assembled monolayers (SAMs) on a gold and gold-capped-cobalt thin film on Au substrates using spectroscopic ellipsometry and magneto-optical Kerr effect spectroscopy and microscopy. The optical and magneto-optical spectra reveal selective chemisorption of the α-helical polyalanine molecules depending on the orientation of the substrate remanent magnetisation during the SAMs process. Moreover, a sign change of the magneto-optical response was observed in some of the magnetic substrates after the chiral SAMs formation.
Bibliographical noteFunding Information:
A. Sharma and G. Salvan acknowledge the financial support provided by the Deutsche Forschungsgemeinschaft (DFG) under project number 282193534. P. Matthes acknowledges financial support through the European Regional Development Fund (EFRE) under grant number 100344605 and the Free State of Saxony. We thank Florian Ott for helpful discussions regarding the sample preparation.
© The Royal Society of Chemistry 2020.