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dc.contributor.authorCrabtree, JM
dc.contributor.authorSoncini, A
dc.date.accessioned2021-02-06T18:57:24Z
dc.date.available2021-02-06T18:57:24Z
dc.date.issued2018
dc.identifier.citationCrabtree, J. M. & Soncini, A. (2018). Toroidal quantum states in molecular spin-frustrated triangular nanomagnets with weak spin-orbit coupling: Applications to molecular spintronics. Physical Review B, 98 (9), https://doi.org/10.1103/PhysRevB.98.094417.
dc.identifier.issn2469-9969
dc.identifier.urihttp://hdl.handle.net/11343/260490
dc.description.abstractWe theoretically investigate the ground-state spin texture and spin transport properties of triangular rings with on-site spins Sq=12(q=1-3). In the limit of strong antiferromagnetic exchange coupling and weak spin-orbit coupling, we find it is possible to prepare a noncollinear degenerate ground state with a zero magnetic moment and a nonzero toroidal moment τ=gμBqrq×Sq, aligned along the C3-symmetry axis. These pure toroidal states can be prepared: (i) within the fourfold degenerate spin-frustrated ground state even without any spin-orbit coupling; (ii) within the ground Kramers doublet resulting from weak spin-orbit splitting of the fourfold degenerate frustrated manifold via Dzyaloshinskii-Moriya antiferromagnetic exchange coupling. We also investigate the relationship between toroidal states and chiral spin states, characterized by the eigenvalues of the scalar spin chirality operator χ=43Ŝ1·Ŝ2×Ŝ3, and find that, since [τ,χ]≠0, it is not possible to prepare states that are both toroidal and chiral simultaneously. Finally, by setting up a quantum transport model in the Coulomb blockade regime, we find that a spin current injected through a spin-polarized source electrode into the triangle is partially reversed upon scattering with the molecular toroidal states. This spin-switching effect is, in fact, a signature of molecular spin-transfer torque, which can be harnessed to modify the nonequilibrium populations of the +τ- and -τ-toroidal states, thus, to induce a net toroidal magnetization in the device using a spin current.
dc.languageEnglish
dc.publisherAmerican Physical Society
dc.titleToroidal quantum states in molecular spin-frustrated triangular nanomagnets with weak spin-orbit coupling: Applications to molecular spintronics
dc.typeJournal Article
dc.identifier.doi10.1103/PhysRevB.98.094417
melbourne.affiliation.departmentSchool of Chemistry
melbourne.source.titlePhysical Review B
melbourne.source.volume98
melbourne.source.issue9
melbourne.identifier.arcDP150103254
melbourne.elementsid1350249
melbourne.contributor.authorSoncini, Alessandro
melbourne.contributor.authorAshtree, Jared
dc.identifier.eissn2469-9969
melbourne.identifier.fundernameidAustralian Research Council, DP150103254
melbourne.accessrightsOpen Access


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