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Issue 34, 2020
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Control of magneto-optical properties of cobalt-layers by adsorption of α-helical polyalanine self-assembled monolayers

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Abstract

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.

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

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Supplementary files

Article information


Submitted
09 Jun 2020
Accepted
27 Jul 2020
First published
28 Jul 2020

J. Mater. Chem. C, 2020,8, 11822-11829
Article type
Paper

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

A. Sharma, P. Matthes, I. Soldatov, S. S. P. K. Arekapudi, B. Böhm, M. Lindner, O. Selyshchev, N. Thi Ngoc Ha, M. Mehring, C. Tegenkamp, S. E. Schulz, D. R. T. Zahn, Y. Paltiel, O. Hellwig and G. Salvan, J. Mater. Chem. C, 2020, 8, 11822
DOI: 10.1039/D0TC02734K

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