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Título

Spin control induced by molecular charging in a transport junction

AutorKaran, Sujoy; García-Fernández, Carlos CSIC ORCID; Karolak, Michael; Jacob, David; Lorente, Nicolás CSIC ORCID CVN; Berndt, Richard
Palabras claveMolecular spintronics
STM
Electron affinity
Electronic transport
Single molecules
Spin excitations
Fecha de publicación2018
EditorAmerican Chemical Society
CitaciónNano Letters 18(1): 88-93 (2018)
ResumenThe ability of molecules to maintain magnetic multistability in nanoscale-junctions will determine their role in downsizing spintronic devices. While spin-injection from ferromagnetic leads gives rise to magnetoresistance in metallic nanocontacts, nonmagnetic leads probing the magnetic states of the junction itself have been considered as an alternative. Extending this experimental approach to molecular junctions, which are sensitive to chemical parameters, we demonstrate that the electron affinity of a molecule decisively influences its spin transport. We use a scanning tunneling microscope to trap a meso-substituted iron porphyrin, putting the iron center in an environment that provides control of its charge and spin states. A large electron affinity of peripheral ligands is shown to enable switching of the molecular S = 1 ground state found at low electron density to S = 1/2 at high density, while lower affinity keeps the molecule inactive to spin-state transition. These results pave the way for spin control using chemical design and electrical means.
Versión del editorhttps://doi.org/10.1021/acs.nanolett.7b03411
URIhttp://hdl.handle.net/10261/178257
DOI10.1021/acs.nanolett.7b03411
ISSN1530-6984
E-ISSN1530-6992
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