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

doi:10.1039/d0tc02734k

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

Department of Applied Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

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.

Original language	American English
Pages (from-to)	11822-11829
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	8
Issue number	34
DOIs	https://doi.org/10.1039/d0tc02734k
State	Published - 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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Sharma, A., Matthes, P., Soldatov, I., Arekapudi, S. S. P. K., Böhm, B., Lindner, M., Selyshchev, O., Thi Ngoc Ha, N., Mehring, M., Tegenkamp, C., Schulz, S. E., Zahn, D. R. T., Paltiel, Y., Hellwig, O., & Salvan, G. (2020). Control of magneto-optical properties of cobalt-layers by adsorption of α-helical polyalanine self-assembled monolayers. Journal of Materials Chemistry C, 8(34), 11822-11829. https://doi.org/10.1039/d0tc02734k

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

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.",

author = "Apoorva Sharma and Patrick Matthes and Ivan Soldatov and Arekapudi, {Sri Sai Phani Kanth} and Benny B{\"o}hm and Marina Lindner and Oleksandr Selyshchev and {Thi Ngoc Ha}, Nguyen and Michael Mehring and Christoph Tegenkamp and Schulz, {Stefan E.} and Zahn, {Dietrich R.T.} and Yossi Paltiel and Olav Hellwig and Georgeta Salvan",

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: {\textcopyright} The Royal Society of Chemistry 2020.",

year = "2020",

month = sep,

day = "14",

doi = "10.1039/d0tc02734k",

language = "American English",

volume = "8",

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Sharma, A, Matthes, P, Soldatov, I, Arekapudi, SSPK, Böhm, B, Lindner, M, Selyshchev, O, Thi Ngoc Ha, N, Mehring, M, Tegenkamp, C, Schulz, SE, Zahn, DRT, Paltiel, Y, Hellwig, O & Salvan, G 2020, 'Control of magneto-optical properties of cobalt-layers by adsorption of α-helical polyalanine self-assembled monolayers', Journal of Materials Chemistry C, vol. 8, no. 34, pp. 11822-11829. https://doi.org/10.1039/d0tc02734k

TY - JOUR

T1 - Control of magneto-optical properties of cobalt-layers by adsorption of α-helical polyalanine self-assembled monolayers

AU - Sharma, Apoorva

AU - Matthes, Patrick

AU - Soldatov, Ivan

AU - Arekapudi, Sri Sai Phani Kanth

AU - Böhm, Benny

AU - Lindner, Marina

AU - Selyshchev, Oleksandr

AU - Thi Ngoc Ha, Nguyen

AU - Mehring, Michael

AU - Tegenkamp, Christoph

AU - Schulz, Stefan E.

AU - Zahn, Dietrich R.T.

AU - Paltiel, Yossi

AU - Hellwig, Olav

AU - Salvan, Georgeta

N1 - 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.

PY - 2020/9/14

Y1 - 2020/9/14

N2 - 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.

AB - 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.

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SN - 2050-7534

VL - 8

SP - 11822

EP - 11829

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 34

ER -

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

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