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

: 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.


Journal of materials chemistry. C, Materials for optical and electronic devices 8 (2020), Nr.34, S.11822-11829
ISSN: 2050-7526
ISSN: 2050-7534
Deutsche Forschungsgemeinschaft DFG
282193534; Kristallisationsmechanismen von CoFeB-basierten TMR-Schichtstapeln bei Laser-Annealing
Fraunhofer ENAS ()

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.