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Exchange Coupling Inversion in a High-Spin Organic Triradical Molecule

AuthorsGaudenzi, Rocco; Burzurí, Enrique; Reta, D.; Moreira, P. R.; Bromley, Stefan T.; Rovira, Concepció ; Veciana, Jaume ; Zant, Herre S. J. van der
KeywordsMagnetic exchange
Molecular electronics
Organic radicals
Issue Date9-Mar-2016
PublisherAmerican Chemical Society
CitationNano Letters 16 (3): 2066–2071 (2016)
AbstractThe magnetic properties of a nanoscale system are inextricably linked to its local environment. In adatoms 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.
Publisher version (URL)http://dx.doi.org/10.1021/acs.nanolett.6b00102
Appears in Collections:(ICMAB) Artículos
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