Control of magneto-optical properties of cobalt-layers by adsorption of α-helical polyalanine self-assembled monolayers

Apoorva Sharma*, Patrick Matthes, Ivan Soldatov, Sri Sai Phani Kanth Arekapudi, Benny Böhm, Marina Lindner, Oleksandr Selyshchev, Nguyen Thi Ngoc Ha, Michael Mehring, Christoph Tegenkamp, Stefan E. Schulz, Dietrich R.T. Zahn, Yossi Paltiel, Olav Hellwig, Georgeta Salvan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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.

Original languageAmerican English
Pages (from-to)11822-11829
Number of pages8
JournalJournal of Materials Chemistry C
Issue number34
StatePublished - 14 Sep 2020

Bibliographical note

Funding 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.

Publisher Copyright:
© The Royal Society of Chemistry 2020.


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