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ACS Nano. 2017 Jul 25;11(7):6868-6880. doi: 10.1021/acsnano.7b02014. Epub 2017 Jun 21.

Giant Magnetoresistance in Carbon Nanotubes with Single-Molecule Magnets TbPc2.

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Ioffe Institute of the Russian Academy of Sciences , 194021 St. Petersburg, Russia.
Lappeenranta University of Technology , P.O. Box 20, 53851 Lappeenranta, Finland.
Institut für Nanotechnologie, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany.
Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology , 76128 Karlsruhe, Germany.
Institut de Physique et Chimie des Materiaux (IPCMS), CNRS-Université de Strasbourg , 67034 Strasbourg, France.
Physikalisches Institut, Karlsruhe Institute of Technology , 76128 Karlsruhe, Germany.
Institut Néel, CNRS and Université Grenoble Alpes , 38000 Grenoble, France.


We present experimental results and a theoretical model for the gate-controlled spin-valve effect in carbon nanotubes with side-attached single-molecule magnets TbPc2 (Terbium(III) bis-phthalocyanine). These structures show a giant magnetoresistance up to 1000% in experiments on single-wall nanotubes that are tunnel-coupled to the leads. The proposed theoretical model combines the spin-dependent Fano effect with Coulomb blockade and predicts a spin-spin interaction between the TbPc2 molecules, mediated by conducting electrons via the charging effect. This gate-tuned interaction is responsible for the stable magnetic ordering of the inner spins of the molecules in the absence of magnetic field. In the case of antiferromagnetic arrangement, electrons with either spin experience the scattering by the molecules, which results in blocking the linear transport. In strong magnetic fields, the Zeeman energy exceeds the effective antiferromagnetic coupling and one species of electrons is not scattered by molecules, which leads to a much lower total resistance at the resonant values of gate voltage, and hence to a supramolecular spin-valve effect.


Coulomb blockade; TbPc2 magnetic molecules; carbon nanotubes; giant magnetoresistance; supramolecular spin-valve effect


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