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Inorganics 2018, 6(2), 49; https://doi.org/10.3390/inorganics6020049

Ferromagnetic Cluster Spin Wave Theory: Concepts and Applications to Magnetic Molecules

Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany
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Received: 23 March 2018 / Revised: 14 May 2018 / Accepted: 16 May 2018 / Published: 19 May 2018
(This article belongs to the Special Issue Single-Molecule Magnets)
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Abstract

Ferromagnetic cluster spin wave theory (FCSWT) provides an exact and concise description of the low-energy excitations from the ferromagnetic ground state in finite magnetic systems, such as bounded magnetic molecules. In particular, this theory is applicable to the description of experimental inelastic neutron scattering (INS) spectra at low temperatures. We provide a detailed conceptual overview of the FCSWT. Additionally, we introduce a pictorial representation of calculated wavefunctions, similar to the usual depiction of vibrational normal modes in molecules. We argue that this representation leads to a better intuitive understanding of the excitations, their symmetry properties, and has links to the energy and wavevector dependence of intensity in the neutron scattering experiments. We apply FCSWT and illustrate the results on a series of examples with available low-temperature INS data, ranging from the Mn10 supertetrahedron, the Mn7 disk to the Mn6 single molecule magnet. View Full-Text
Keywords: ferromagnetic molecules; single molecule magnet; Ising model; magnetic exchange; spin waves ferromagnetic molecules; single molecule magnet; Ising model; magnetic exchange; spin waves
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Prša, K.; Waldmann, O. Ferromagnetic Cluster Spin Wave Theory: Concepts and Applications to Magnetic Molecules. Inorganics 2018, 6, 49.

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