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Updated: Jan 12, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
Room Temperature Spin-Dependent Transport in 2D Hofmann-Type Single-Layer Network
Mauricio R Aguilar1,2, Alejandro Martín-Rodríguez1,2, Silvia Gómez-Coca1,2
1Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Diagonal 645, Barcelona, 08028, Spain.
None:
Room-temperature magnetoresistance effect is reported on a 2D molecular-based magnetic system using only one magnetic electrode, unlike the typical spin-valve systems with two magnetic electrodes. Charge transport is measured using a scanning tunneling microscope on a molecular monolayer of a Hofmann-type network consisting of a 2D [Pt(CN)4Co]x system. The layer is grown on a gold substrate by prior deposition of 4-(ethyldisulfaneyl)pyridine (EtS-Spy) so that the generated 4-pyridinethiyl radical (pyS), anchored to gold through S, coordinates the CoII ions through the pyridine. The formation of the 2D [Pt(CN)4Co]x layer is verified by the presence of only bridging cyanide bands using vibrational spectroscopy. Employing a 4-mercaptopyridine-functionalized magnetic nickel tip, the reversal of the nickel magnetization direction results in the shutdown of the peak corresponding to the transport through the path formed by Ni-Spy-Co-pyS-Au, around 10-4 G0 of conductance. This assignment is confirmed by flicker noise analysis and Non-Equilibrium Green's-functions-based density functional theory calculations, indicating that the 10-4 G0 conductance feature corresponds to through-bond charge transport while the one observed at 2·10-5 G0 involves intermolecular contacts. This effect has been previously reported for magnetic molecules; however, its extension to 2D systems introduces an essential capability for applications in new spintronic devices.
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