Density-functional investigations of the spin ordering in Fe13 clusters

P. Bobadova-Parvanova, K. A. Jackson, S. Srinivas, M. Horoi

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61 Scopus citations

Abstract

A recently developed two-step computational strategy [P. Bobadova-Parvanova et al., J. Chem. Phys. 116, 3576 (2002)] is used to investigate the geometric and magnetic properties of Fe13. The method combines an unbiased search of the cluster energy surface using a density-functional-based tight-binding method, followed by fully self-consistent density-functional theory (DFT) calculations for detailed studies of the low-lying structures. The calculations indicate that the geometry of the Fe13 cluster is a distorted icosahedron. Careful investigations of the optimal spin state of Fe13 show the existence of two different magnetic orderings for the cluster - a ferromagnetically ordered state in which all atoms have approximately the same magnetic moment (3μB) and a nominally antiferromagnetic state in which the moment of the central atom is flipped with respect to those of the surface atoms. The relationship between cluster bond lengths and the magnetic ordering suggests that a transition in spin ordering could be driven by uniformly changing the geometric parameters in this cluster.

Original languageEnglish
Article number195402
Pages (from-to)1954021-19540210
Number of pages17586190
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number19
DOIs
StatePublished - Nov 15 2002

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