Influence of antisymmetric exchange interaction on quantum tunneling of magnetization in a dimeric molecular magnet Mn-6

S. Bahr, C. J. Milios, L. F. Jones, E. K. Brechin, V. Mosser, W. Wernsdorfer

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We present magnetization measurements on the single molecule magnet Mn-6, revealing various tunnel transitions inconsistent with a giant-spin description. We propose a dimeric model of the molecule with two coupled spins S=6, which involves crystal-field anisotropy, symmetric Heisenberg exchange interaction, and antisymmetric Dzyaloshinskii-Moriya exchange interaction. We show that this simplified model of the molecule explains the experimentally observed tunnel transitions and that the antisymmetric exchange interaction between the spins gives rise to tunneling processes between spin states belonging to different spin multiplets.

Original languageEnglish
Article number132401
Pages (from-to)-
Number of pages4
JournalPhysical Review B
Issue number13
Publication statusPublished - Oct 2008

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