Non-exponential relaxation and quantum tunnel splitting in molecular magnet Fe8

Abstract

Magnetic relaxation in molecular magnets under a sweeping field is studied by taking into account local stray fields. It is found that the randomness of local stray field leads to a distribution of the relaxation rate which subsequently makes the relaxation deviate from the exponential law as predicted by the Landau-Zener model such that the Landau-Zener method needs to be revised to deduce an exact tunneling splitting. The tunneling splitting and distribution width of local stray fields are derived from the experimental data for molecular magnets Fe8.

4 pages, 4 figures

References in corpus (11)

• Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules
• Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization
• The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8
• Nuclear spin driven resonant tunnelling of magnetisation in Mn12 acetate
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• Suppression of Quantum Phase Interference in Molecular Magnets Fe₈ with Dipolar-Dipolar Interaction

Cited by in corpus (2)

• Gutzwiller Approach for Elementary Excitations in $S=1$ Antiferromagnetic Chains
• Landau-Zener tunneling with many-body quantum effects in crystals of molecular magnets