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Issue 2, 2018
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Bacteriorhodopsin based non-magnetic spin filters for biomolecular spintronics

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Abstract

We discuss spin injection and spin valves, which are based on organic and biomolecules, that offer the possibility to overcome some of the limitations of solid-state devices, which are based on ferromagnetic metal electrodes. In particular, we discuss spin filtering through bacteriorhodopsin in a solid state biomolecular spin valve that is based on the chirality induced spin selectivity (CISS) effect and shows a magnetoresistance of ∼2% at room temperature. The device is fabricated using a layer of bacteriorhodopsin (treated with n-octyl-thioglucoside detergent: OTG-bR) that is adsorbed on a cysteamine functionalized gold electrode and capped with a magnesium oxide layer as a tunneling barrier, upon which a Ni top electrode film is placed and used as a spin analyzer. The bR based spin valves show an antisymmetric magnetoresistance response when a magnetic field is applied along the direction of the current flow, whereas they display a positive symmetric magnetoresistance curve when a magnetic field is applied perpendicular to the current direction.

Graphical abstract: Bacteriorhodopsin based non-magnetic spin filters for biomolecular spintronics

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Submitted
04 Oct 2017
Accepted
27 Nov 2017
First published
27 Nov 2017

Phys. Chem. Chem. Phys., 2018,20, 1091-1097
Article type
Paper

Bacteriorhodopsin based non-magnetic spin filters for biomolecular spintronics

V. Varade, T. Markus, K. Vankayala, N. Friedman, M. Sheves, D. H. Waldeck and R. Naaman, Phys. Chem. Chem. Phys., 2018, 20, 1091
DOI: 10.1039/C7CP06771B

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