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      Molecular Quantum Spintronics: Supramolecular Spin Valves Based on Single-Molecule Magnets and Carbon Nanotubes


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          We built new hybrid devices consisting of chemical vapor deposition (CVD) grown carbon nanotube (CNT) transistors, decorated with TbPc 2 (Pc = phthalocyanine) rare-earth based single-molecule magnets (SMMs). The drafting was achieved by tailoring supramolecular π-π interactions between CNTs and SMMs. The magnetoresistance hysteresis loop measurements revealed steep steps, which we can relate to the magnetization reversal of individual SMMs. Indeed, we established that the electronic transport properties of these devices depend strongly on the relative magnetization orientations of the grafted SMMs. The SMMs are playing the role of localized spin polarizer and analyzer on the CNT electronic conducting channel. As a result, we measured magneto-resistance ratios up to several hundred percent. We used this spin valve effect to confirm the strong uniaxial anisotropy and the superparamagnetic blocking temperature ( T B ~ 1 K) of isolated TbPc 2 SMMs. For the first time, the strength of exchange interaction between the different SMMs of the molecular spin valve geometry could be determined. Our results introduce a new design for operable molecular spintronic devices using the quantum effects of individual SMMs.

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          Molecular spintronics using single-molecule magnets.

          A revolution in electronics is in view, with the contemporary evolution of the two novel disciplines of spintronics and molecular electronics. A fundamental link between these two fields can be established using molecular magnetic materials and, in particular, single-molecule magnets. Here, we review the first progress in the resulting field, molecular spintronics, which will enable the manipulation of spin and charges in electronic devices containing one or more molecules. We discuss the advantages over more conventional materials, and the potential applications in information storage and processing. We also outline current challenges in the field, and propose convenient schemes to overcome them.
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            Quantum phase interference and parity effects in magnetic molecular clusters

            An experimental method based on the Landau-Zener model was developed to measure very small tunnel splittings in molecular clusters of eight iron atoms, which at low temperature behave like a nanomagnet with a spin ground state of S = 10. The observed oscillations of the tunnel splittings as a function of the magnetic field applied along the hard anisotropy axis are due to topological quantum interference of two tunnel paths of opposite windings. Transitions between quantum numbers M = -S and (S - n), with n even or odd, revealed a parity effect that is analogous to the suppression of tunneling predicted for half-integer spins. This observation is direct evidence of the topological part of the quantum spin phase (Berry phase) in a magnetic system.
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              Synthesis of individual single-walled carbon nanotubes on patterned silicon wafers


                Author and article information

                Int J Mol Sci
                International Journal of Molecular Sciences
                Molecular Diversity Preservation International (MDPI)
                10 October 2011
                : 12
                : 10
                : 6656-6667
                [1 ]Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France; E-Mails: matias.urdampilleta@ 123456grenoble.cnrs.fr (M.U.); ngoc-viet.nguyen@ 123456grenoble.cnrs.fr (N.-V.N.); jean-pierre.cleuziou@ 123456grenoble.cnrs.fr (J.-P.C.)
                [2 ]Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany; E-Mails: svetlana.klyatskaya@ 123456kit.edu (S.K.); mario.ruben@ 123456kit.edu (M.R.)
                [3 ]Institute de Physique et Chimie de Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 67034 Strasbourg, France
                Author notes
                [* ]Author to whom correspondence should be addressed; E-Mail: wolfgang.wernsdorfer@ 123456grenoble.cnrs.fr ; Tel.: +33-0-47688-7909.
                © 2011 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                : 18 July 2011
                : 14 September 2011
                : 26 September 2011

                Molecular biology
                molecular magnets,molecular quantum spintronics,nanoelectronics devices
                Molecular biology
                molecular magnets, molecular quantum spintronics, nanoelectronics devices


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