Issue 27, 2024

Spin polarized current in chiral organic radical monolayers

Abstract

The chirality-induced spin selectivity (CISS) effect is the capability of chiral molecules to act as spin filters, i.e. to selectively sort flowing electrons based on their spin states. The application of this captivating phenomenon holds great promise in the realm of molecular spintronics, where the primary focus lies in advancing technologies based on chiral molecules to regulate the injection and coherence of spin-polarized currents. In this context, we conducted a study to explore the spin filtering capabilities of a monolayer of the thia-bridged triarylamine hetero[4]helicene radical cation chemisorbed on a metallic surface. Magnetic–conductive atomic force microscopy revealed efficient electron spin filtering at exceptionally low potentials. Furthermore, we constructed a spintronic device by incorporating a monolayer of these molecules in between two electrodes, obtaining an asymmetric magnetoresistance trend with signal inversion in accordance with the handedness of the enantiomer involved, indicative of the presence of the CISS effect. Our findings underscore the significance of thia[4]azahelicene organic radicals as promising candidates for the development of quantum information operations based on the CISS effect as a tool to control the molecular spin states.

Graphical abstract: Spin polarized current in chiral organic radical monolayers

Supplementary files

Article information

Article type
Paper
Submitted
08 mar 2024
Accepted
03 jun 2024
First published
03 jun 2024
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2024,12, 10029-10035

Spin polarized current in chiral organic radical monolayers

N. Giaconi, M. Lupi, T. K. Das, A. Kumar, L. Poggini, C. Viglianisi, L. Sorace, S. Menichetti, R. Naaman, R. Sessoli and M. Mannini, J. Mater. Chem. C, 2024, 12, 10029 DOI: 10.1039/D4TC00944D

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