NMR as a probe of the relaxation of the magnetization in magnetic molecules

P. Santini, S. Carretta, E. Liviotti, G. Amoretti, P. Carretta, M. Filibian, A. Lascialfari, E. Micotti

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We investigate the time autocorrelation of the molecular magnetization M(t) for three classes of magnetic molecules (antiferromagnetic rings, grids, and nanomagnets), in contact with the phonon heat bath. For all three classes, we find that the exponential decay of the fluctuations of M(t) is characterized by a single characteristic time τ(T, B) for not too high temperature T and field B. This is reflected in a nearly single-Lorentzian shape of the spectral density of the fluctuations. We show that such fluctuations are effectively probed by NMR, and that our theory explains the recent phenomenological observation by Back et al. [Phys. Rev. B 70, 134434 (2004)] that the Larmor-frequency dependence of 1/T1] data in a large number of AFM rings fits to a single-Lorentzian form.

Original languageEnglish
Article number077203
JournalPhysical Review Letters
Issue number7
Publication statusPublished - Feb 25 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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