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Title: Change of cobalt magnetic anisotropy and spin polarization with alkanethiolates self-assembled monolayers
Authors: Campiglio, Paolo
Breitwieser, Romain
Repain, Vincent
Guitteny, Solene
Chacon, Cyril
Bellec, Amandine
Lagoute, Jerome
Girard, Yann
Rousset, Sylvie
Sassella, Adele
Imam, Mighfar
Narasimhan, Shobhana
Keywords: Physics
magnetic anisotropy
self-assembled monolayers
scanning tunneling microscopy
Molecular Spintronics
Issue Date: 2015
Publisher: IOP Publishing Ltd
Citation: New Journal of Physics
Campiglio, P.; Breitwieser, R.; Repain, V.; Guitteny, S.; Chacon, C.; Bellec, A.; Lagoute, J.; Girard, Y.; Rousset, S.; Sassella, A.; Imam, M.; Narasimhan, S., Change of cobalt magnetic anisotropy and spin polarization with alkanethiolates self-assembled monolayers. New Journal of Physics 2015, 17, 10.
Abstract: We demonstrate that the deposition of a self-assembled monolayer of alkanethiolates on a 1 nm thick cobalt ultrathin film grown on Au(111) induces a spin reorientation transition from in-plane to out-of-plane magnetization. Using ab initio calculations, we show that a methanethiolate layer changes slightly both the magnetocrystalline and shape anisotropy, both effects almost cancelling each other out for a 1 nm Co film. Finally, the change in hysteresis cycles upon alkanethiolate adsorption could be assigned to a molecular-induced roughening of the Co layer, as shown by STM. In addition, we calculate how a methanethiolate layer modifies the spin density of states of the Co layer and we show that the spin polarization at the Fermi level through the organic layer is reversed as compared to the uncovered Co. These results give new theoretical and experimental insights for the use of thiol-based self-assembled monolayers in spintronic devices.
Description: Restricted access
ISSN: 1367-2630
Appears in Collections:Research Articles (Shobhana Narasimhan)

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