Influence of antisymmetric exchange interaction on quantum tunneling of magnetization in a dimeric molecular magnet Mn6

Abstract

We present magnetization measurements on the single molecule magnet Mn6, 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.

5 pages, 4 figures

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Cited by in corpus (6)

• Origin and spectroscopic determination of trigonal anisotropy in a heteronuclear single-molecule magnet
• Asymmetric Berry-Phase Interference Patterns in a Single-Molecule Magnet
• Inelastic neutron scattering and frequency domain magnetic resonance studies of S=4 and S=12 Mn${}_6$ single-molecule magnets
• Non-equilibrium transport through quantum dots with Dzyaloshinsky--Moriya--Kondo interaction
• Dzyaloshinskii-Moriya interaction in transport through single molecule transistors
• Tunneling and inversion symmetry in single-molecule magnets: the case of the Mn12 wheel molecule