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• W2891557639 abstract "We theoretically investigate the ground-state spin texture and spin transport properties of triangular rings with on-site spins ${S}_{q}=frac{1}{2}phantom{rule{0.28em}{0ex}}(q=1--3)$. 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 $mathbf{ensuremath{tau}}=g{ensuremath{mu}}_{B}{ensuremath{sum}}_{q}{mathbf{r}}_{q}ifmmodetimeselsetexttimesfi{}{mathbf{S}}_{q}$, aligned along the ${C}_{3}$-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 $stackrel{ifmmode hat{}else ^{}fi{}}{ensuremath{chi}}=frac{4}{sqrt{3}}{stackrel{ifmmode hat{}else ^{}fi{}}{mathbf{S}}}_{1}ifmmodecdotelsetextperiodcenteredfi{}{stackrel{ifmmode hat{}else ^{}fi{}}{mathbf{S}}}_{2}ifmmodetimeselsetexttimesfi{}{stackrel{ifmmode hat{}else ^{}fi{}}{mathbf{S}}}_{3}$, and find that, since $[stackrel{ifmmode hat{}else ^{}fi{}}{mathbf{ensuremath{tau}}},stackrel{ifmmode hat{}else ^{}fi{}}{ensuremath{chi}}]ensuremath{ne}0$, 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 $+ensuremath{tau}$- and $ensuremath{-}ensuremath{tau}$-toroidal states, thus, to induce a net toroidal magnetization in the device using a spin current." @default.
• W2891557639 created "2018-09-27" @default.
• W2891557639 creator A5070148430 @default.
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• W2891557639 date "2018-09-14" @default.
• W2891557639 modified "2023-09-26" @default.
• W2891557639 title "Toroidal quantum states in molecular spin-frustrated triangular nanomagnets with weak spin-orbit coupling: Applications to molecular spintronics" @default.
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• W2891557639 doi "https://doi.org/10.1103/physrevb.98.094417" @default.
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