论文信息 - Modeling of the Experimental Molecular-Based Ring-Shaped Nanomagnets

Modeling of the Experimental Molecular-Based Ring-Shaped Nanomagnets

Modeling of the Experimental Molecular-Based Ring-Shaped Nanomagnets M. Antkowiak, P. Kozlowski, G. Musial, W. Florek, G. Kamieniarz∗ Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland and F. Esposito Dipartimento di Scienze Fisiche, Universita di Napoli, Napoli, Italy Quantum transfer matrix technique and numerically exact diagonalization method are applied to the Heisenberg spin systems to model ring-shaped molecules. Two cases are investigated: (i) a dozen of S = 1 spins with additional biquadratic exchange and (ii) a dimetallic molecule Cr7Cd, where it is assumed that exchange anisotropy is determined in a local coordination system. In the latter case the calculated susceptibility is compared with experimental results.

[1] 李幼升,et al. Ph , 1989 .

[2] Marco Affronte,et al. Engineering the coupling between molecular spin qubits by coordination chemistry. , 2009, Nature nanotechnology.

[3] Dante Gatteschi,et al. Single-ion anisotropy effects on the energy spectra of spin S = 1 Heisenberg ring , 2007 .

[4] Grigore A. Timco,et al. Studies of chromium cages and wheels , 2005 .

[5] A. Talarico,et al. Magnetic memory of a single-molecule quantum magnet wired to a gold surface. , 2009, Nature materials.

[6] F. Neese,et al. EPR spectroscopy of a family of Cr(III) 7M(II) (M = Cd, Zn, Mn, Ni) "wheels": studies of isostructural compounds with different spin ground states. , 2009, Chemistry.

[7] G. Musiał,et al. Phenomenological modeling of molecular-based rings beyond the strong exchange limit: Bond alternation and single-ion anisotropy effects , 2008 .