Exchange coupling inversion in a high-spin organic triradical molecule

The magnetic properties of a nanoscale system are inextricably linked to its local environment. In ad-atoms on surfaces and inorganic layered structures the exchange interactions result from the relative lattice positions, layer thicknesses and other environmental parameters. Here, we report on a sa...

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Bibliographic Details
Published in:arXiv.org 2016-02
Main Authors: Gaudenzi, R, Burzurí, E, Reta, D, I de P R Moreira, Bromley, S T, Rovira, C, Veciana, J, H S J van der Zant
Format: Article
Language:English
Subjects:
Antiferromagnetism
Coupling
Coupling (molecular)
Exchanging
Magnetic properties
Nanotechnology devices
Organic chemistry
Thickness
Online Access:Get full text
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Summary:The magnetic properties of a nanoscale system are inextricably linked to its local environment. In ad-atoms on surfaces and inorganic layered structures the exchange interactions result from the relative lattice positions, layer thicknesses and other environmental parameters. Here, we report on a sample-dependent sign inversion of the magnetic exchange coupling between the three unpaired spins of an organic triradical molecule embedded in a three-terminal device. This ferro-to-antiferromagnetic transition is due to structural 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, the flexibility of the molecule yields an in-situ electric tunability of the exchange coupling via the gate electrode. These findings open a route to the controlled reversal of the magnetic states in organic molecule-based nanodevices by mechanical means, electrical gating or chemical tailoring.
ISSN:2331-8422
DOI:10.48550/arxiv.1602.03678