Advanced Materials

Molecular Thin Films: A New Type of Magnetic Switch

Authors

  • S. Heutz,

    1. Department of Materials and London Centre for Nanotechnology, Imperial College London, London SW7 2AZ (UK)
    2. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • C. Mitra,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • W. Wu,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • A. J. Fisher,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • A. Kerridge,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
    2. Present address: Department of Chemistry, University College London, London WC1E 6BT, UK
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  • M. Stoneham,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • A.  H. Harker,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • J. Gardener,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • H.-H. Tseng,

    1. Department of Chemistry and London Centre for Nanotechnology, Imperial College London, London SW7 2AZ (UK)
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  • T. S. Jones,

    1. Department of Chemistry and London Centre for Nanotechnology, Imperial College London, London SW7 2AZ (UK)
    2. Present address: DPMC–MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
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  • C. Renner,

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
    2. Present address: Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
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  • G. Aeppli

    1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT (UK)
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  • S.H. thanks the Royal Society for a Dorothy Hodgkin research fellowship. Financial support from the Research Council UK and the Engineering and Physical Sciences Research Council (EPSRC) Basic Technology grant “Putting the Quantum into Information Technology” and a Royal Society Wolfson Research Merit Award is gratefully acknowledged.

Abstract

The magnetic coupling of flexible metal phthalocyanine (MPc) thin films can be modified depending on the polymorphic form adopted by the crystals. A simple annealing procedure can switch the couplings from antiferromagnetic to ferromagnetic (MnPc) or paramagnetic (CuPc), opening up avenues for spintronic applications. Density functional and perturbation theories rationalize these trends and attribute the coupling mechanism to indirect exchange.

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