Relaxation time of the nanomagnet Fe4

E. Rastelli and A. Tassi
Phys. Rev. B 79, 104415 – Published 13 March 2009

Abstract

The magnetic behavior of the molecular nanomagnet Fe4 is very well simulated by a single-spin model Hamiltonian in a crystal field with S=5. The crystal-field parameters were determined from the inelastic neutron scattering spectra. Here we show that the quantum effects are crucial to understand the saturation of the relaxation time observed at very low temperature at variance with the standard master equation result that leads to an Arrhenius law at any temperature. Very deep downward spikes in correspondence to the anticrossing fields are found in the relaxation time vs field at low temperature. We compare our results with those obtained by previous approaches worked out to fit experimental data on Mn12.

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  • Received 16 September 2008

DOI:https://doi.org/10.1103/PhysRevB.79.104415

©2009 American Physical Society

Authors & Affiliations

E. Rastelli* and A. Tassi

  • Dipartimento di Fisica dell’Università, Parco Area delle Scienze 7/A, 43100 Parma, Italy

  • *Also at Istituto IMEM of CNR, Parco Area delle Scienze, 43100 Parma, Italy; rastelli@fis.unipr.it

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Vol. 79, Iss. 10 — 1 March 2009

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