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Supramolecular Spin Valve Effects in Graphene Quantum Dots Decorated with Mn<sub>12</sub> Single Molecule Magnets

ORAL

Abstract

Single-molecule magnets (SMMs) are made of a core of magnetic ions embedded in a ligand shell. Their unique properties make them viable for applications in quantum computing and spintronics, making it essential to be able to read and manipulate their spin states. Previous work demonstrated an electronic read-out of SMMs magnetization switching with a supramolecular spin valve, a device made of a carbon nanotube or graphene quantum dot with a few SMMs (TbPc2) deposited on it [1, 2]. A parallel alignment of the SMMs spins gives higher conductance than an antiparallel one. All the measurements were done at T<1K, and a gate voltage tuned away from the Coulomb blockade region [1, 2].



Here we present supramolecular spin valve effects up to 70 K in graphene quantum dots that are not gated and are decorated with Mn12 SMMs. We explain these results by considering the effect of SMMs on hot-electron transport in the graphene quantum dots.



References:



  1. 1. Urdampilleta et al., Nature Mater 10, 502–506 (2011).

    2. Godfrin et al., ACS Nano 11, 3984-3989 (2017).

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Presenters

  • Amjad Alqahtani

    Georgetown University

Authors

  • Amjad Alqahtani

    Georgetown University

  • DaVonne Henry

    Georgetown University

  • Luke St. Marie

    Georgetown University

  • 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

    University of California, Santa Barbara

  • Rachael L Myers-Ward

    US Naval Research 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

  • Abdelouahad El Fatimy

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

  • David K Gaskill

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

  • 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