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Detecting Magnetic Switching in Single-Molecule Magnet Mn<sub>12</sub> using Graphene Quantum Dots

ORAL

Abstract

Transport measurements through a graphene quantum dot device decorated with single-molecule magnet (SMM) Mn12 powder indicate stochastic switching of the magnetization in the molecules. Here we show that discrete changes in the graphene conductance can be attributed to magnetic switching of the molecules. The local magnetic field causes a change in the activation energy of the hot electrons in the quantum dot [1], allowing the graphene device to serve as a sensitive detector for the spin state of the proximate molecules and as a probe to measure the interaction between the SMMs and the graphene. The size of the activation energy change is too large to be explained by Zeeman effects owing to the dipole field, suggesting an exchange bias interaction between the graphene and the molecules.



[1] A. El Fatimy et al. Nature Nanotechnology 11, 335-338 (2016)

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Presenters

  • DaVonne Henry

    Georgetown University

Authors

  • DaVonne Henry

    Georgetown University

  • Amjad Alqahtani

    Georgetown University

  • luke st marie

    Georgetown University

  • Samuel I Felsenfeld

    University of Maryland, College Park

  • Lubomir Havlicek

    Central European Institute of Technology, Brno Unversity of Technology, CEITEC, Brno University of Technology

  • Jakub Hruby

    National High Magnetic Field Laboratory

  • Antonin Sojka

    Central European Institute of Technology, Brno Unversity of Technology

  • Jorge Navarro

    Central European Institute of Technology, Brno Unversity of Technology

  • Abdelouahad El Fatimy

    Institute of Applied Physics, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir, 43150, Morocco., Mohammed VI Polytechnic University

  • Rachael L Myers-Ward

    US Naval Research Laboratory, U.S. Naval Research Laboratory

  • David K Gaskill

    University of Maryland, U.S. Naval Reserach Laboratory, U.S. Naval Research Laboratory

  • Daniel Pennachio

    US Naval Research Laboratory, U.S. Naval Reserach Laboratory, U.S. Naval Research Laboratory

  • Jenifer Hajzus

    US Naval Research Laboratory, U.S. Naval Reserach Laboratory, ASEE Research Associate at the U.S. Naval Research Laboratory

  • Albert F Rigosi

    National Institute of Standards and Technology, NIST

  • Ivan Nemec

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

  • Petr Neugebauer

    brno university of Technology, CEITEC, Central European Institute of Technology, CEITEC BUT, Purkynova 656/123, Brno 61200, Czech Republic, Central European Institute of Technology, CEITEC, Brno University of Technology

  • Amy Y Liu

    Georgetown University

  • Paola Barbara

    Georgetown University, Department Physics, Georgetown University