Exchange coupling inversion in a high-spin organic triradical molecule

R Gaudenzi, E Burzuri Linares, D Reta, PR de Moreira, ST Bromley, C Rovira, J Veciana, HSJ van der Zant

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)

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
Original languageEnglish
Pages (from-to)2066-2071
JournalNano Letters: a journal dedicated to nanoscience and nanotechnology
Volume16
Issue number3
DOIs
Publication statusPublished - 2016

Bibliographical note

Harvest
Available online February 10,2016

Keywords

  • Organic radicals
  • pintronics
  • molecular electronics
  • polyradicals
  • magnetic exchange

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