Exchange coupling inversion in a high-spin organic triradical molecule

Journal article (2016)

Authors

R. Gaudenzi QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
E. Burzuri Linares QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
D Reta Universitat Politecnica de Catalunya
PR de Moreira Universitat Politecnica de Catalunya
ST Bromley Universitat Politecnica de Catalunya
C Rovira Catalan Institution for Research and Advanced Studies (ICREA)
J Veciana Catalan Institution for Research and Advanced Studies (ICREA)
H.S.J. van der Zant QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
Research Group
QN/van der Zant Lab (AS) (TU Delft)
Molecular electronics Organic radicals Pintronics Polyradicals Magnetic exchange
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Published Date

2016

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/van der Zant Lab

Abstract

The magnetic properties of a nanoscale systemare inextricably linked to its local environment. In adatoms onsurfaces and inorganic layered structures, the exchangeinteractions result from the relative lattice positions, layerthicknesses, and other environmental parameters. Here, wereport on a sample-dependent sign inversion of the magneticexchange coupling between the three unpaired spins of anorganic triradical molecule embedded in a three-terminaldevice. This ferro-to-antiferromagnetic transition is due tostructural distortions and results in a high-to-low spin ground-state change in a molecule traditionally considered to be a robust high-spin quartet. Moreover, theflexibility of the moleculeyields an in situ electric tunability of the exchange coupling via the gate electrode. Thesefindings open a route to the controlledreversal of the magnetic states in organic molecule-based nanodevices by mechanical means, electrical gating, or chemicaltailoring