Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-02-24
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 8 figures
Scientific paper
A detailed multifrequency high field - high frequency EPR (95-285 GHz) study has been performed on the single-molecule magnet of formula [Fe8O2(OH)12(tacn)6]Br8 9H2O, where tacn=1,4,7-triazacyclononane. Polycrystalline powder spectra have allowed estimating the zero field splitting parameters up to the fourth order terms. The single crystal spectra have provided the principal directions of the magnetic anisotropy of the cluster. These results have been compared to an evaluation of the intra-cluster dipolar contribution to the magnetic anisotropy, suggesting that single ion anisotropy is mainly contributing to the magnetic anisotropy. The role of the transverse magnetic anisotropy in determining the height of the barrier for the reversal of the magnetization is also discussed.
Barra Anne Laure
Gatteschi Dante
Sessoli Roberta
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