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Electrically Addressing the Spin of a Magnetic Porphyrin through Covalently Connected Graphene Electrodes

AuthorsLi, Jingcheng; Friedrich, Niklas; Merino, Nelson; Oteyza, D. G. de ; Peña, Diego; Jacob, David; Pascual, José I.
KeywordsScanning tunneling microscope
Two-terminal transport measurement
Spin excitation
Magnetic porphyrin
Graphene nanoribbon
Two-orbital Anderson impurity model
Issue Date8-May-2019
PublisherAmerican Chemical Society
CitationNano Letters 19(5): 3288-3294 (2019)
AbstractWe report on the fabrication and transport characterization of atomically precise single-molecule devices consisting of a magnetic porphyrin covalently wired by graphene nanoribbon electrodes. The tip of a scanning tunneling microscope was utilized to contact the end of a GNR-porphyrin-GNR hybrid system and create a molecular bridge between the tip and sample for transport measurements. Electrons tunneling through the suspended molecular heterostructure excited the spin multiplet of the magnetic porphyrin. The detachment of certain spin centers from the surface shifted their spin-carrying orbitals away from an on-surface mixed-valence configuration, recovering its original spin state. The existence of spin-polarized resonances in the free-standing systems and their electrical addressability is the fundamental step in the utilization of carbon-based materials as functional molecular spintronics systems.
Publisher version (URL)http://dx.doi.org/10.1021/acs.nanolett.9b00883
Identifiersdoi: 10.1021/acs.nanolett.9b00883
e-issn: 1530-6992
issn: 1530-6984
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