Local field dynamics in a resonant quantum tunneling system of magnetic molecules

T. Ohm, C. Sangregorio and C. Paulsen

The European Physical Journal B: Condensed Matter and Complex Systems, 1998, vol. 6, issue 2, 195-199

Abstract: We observed non-exponential relaxation for a quantum tunneling molecular magnetic system at very low temperatures and argue that it results from evolving intermolecular dipole fields. At the very beginning of the relaxation, the magnetization follows a square-root time dependence. A simple model is developed for the intermediate time range that is in good agreement with the data over 4 decades in time. Detailed numerical calculations as well as measurements are presented which indicate unusual correlation effects in these systems. Copyright EDP Sciences, Springer-Verlag 1998

Keywords: PACS.75.45.+j Macroscopic quantum phenomena in magnetic systems-61.46.+w Clusters; nanoparticles; and nanocrystalline materials-75.60.Ej Magnetization curves; hysteresis; Barkhausen and related effects (search for similar items in EconPapers)
Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:spr:eurphb:v:6:y:1998:i:2:p:195-199:10.1007/s100510050541

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DOI: 10.1007/s100510050541

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