Supramolecular Spin Valve Effects in Graphene Quantum Dots Decorated with Single Molecule Magnets

ORAL

Abstract

Single-molecule magnets (SMMs) have promising applications in quantum computing and molecular spintronics. Previous work demonstrated spin valve effects in hybrid devices made of carbon nanotube or graphene quantum dots decorated with a few TbPc2 SMMs, yielding higher or lower electrical conductance through the dots depending on whether the magnetic moments of the molecules had parallel or antiparallel orientation. This electrical detection of the magnetization switching was demonstrated at temperatures below 0.6 K and by tuning the gate voltage of the quantum dot away from the Coulomb blockade region, in the conducting regime [1].

Herein, we present similar results using graphene quantum dot devices that are not gated and are decorated with Mn12 SMMs. Taking transport measurements of the devices, we have observed magnetization switching at high temperatures (as high as 60K), allowing studies of the switching dynamics of Mn12 molecules in a wide temperature range.

Reference

1. Urdampilleta, M., Klyatskaya, S., Cleuziou, JP. et al. Supramolecular spin valves. Nature Mater 10, 502–506 (2011). https://doi.org/10.1038/nmat3050

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Presenters

  • Amjad Alqahtani

    • Georgetown University

Authors

  • Amjad Alqahtani

    • Georgetown University

  • Luke St. Marie

    • Georgetown University

  • DaVonne Henry

    • Georgetown University

  • Lubomir Havlicek

    • Ceitec Institute, Brno University

  • Jakub Hruby

    • Ceitec Institute, Brno University

  • Antonin Sojka

    • Ceitec Institute, Brno University

  • Jorge Navarro

    • Ceitec Institute, Brno University

  • Rachael L Myers-Ward2

    • U.S. Naval Research Laboratory
    • United States Naval Research Laboratory
    • U.S. Naval Research Laboratory, Washington, DC
    • U.S. Naval Research Laboratory, Washington, DC 20375, USA

  • Kurt D Gaskill

    • U.S. Naval Research Laboratory
    • Institution for Research in Electronics and Applied Physics, University of Maryland, College Park MD
    • University of Maryland
    • Institution for Research in Electronics and Applied Physics, University of Maryland, College Park MD 20740

  • Ivan Nemec

    • Brno University of Technology, CEITEC
    • Ceitec Institute, Palacky University

  • Petr Neugebauer

    • Brno University of Technology, CEITEC
    • Ceitec Institute, Brno University
    • Central European Institute of Technology

  • Amy Y Liu

    • Georgetown University

  • Paola Barbara

    • Georgetown University