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

Research output: Contribution to journalArticle

Abstract

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
Volume94
Issue number7
DOIs
Publication statusPublished - Feb 25 2005

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magnetization
nuclear magnetic resonance
probes
molecules
rings
autocorrelation
baths
grids
atomic force microscopy
heat
decay

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Santini, P., Carretta, S., Liviotti, E., Amoretti, G., Carretta, P., Filibian, M., ... Micotti, E. (2005). NMR as a probe of the relaxation of the magnetization in magnetic molecules. Physical Review Letters, 94(7), [077203]. https://doi.org/10.1103/PhysRevLett.94.077203

NMR as a probe of the relaxation of the magnetization in magnetic molecules. / Santini, P.; Carretta, S.; Liviotti, E.; Amoretti, G.; Carretta, P.; Filibian, M.; Lascialfari, A.; Micotti, E.

In: Physical Review Letters, Vol. 94, No. 7, 077203, 25.02.2005.

Research output: Contribution to journalArticle

Santini, P, Carretta, S, Liviotti, E, Amoretti, G, Carretta, P, Filibian, M, Lascialfari, A & Micotti, E 2005, 'NMR as a probe of the relaxation of the magnetization in magnetic molecules', Physical Review Letters, vol. 94, no. 7, 077203. https://doi.org/10.1103/PhysRevLett.94.077203
Santini P, Carretta S, Liviotti E, Amoretti G, Carretta P, Filibian M et al. NMR as a probe of the relaxation of the magnetization in magnetic molecules. Physical Review Letters. 2005 Feb 25;94(7). 077203. https://doi.org/10.1103/PhysRevLett.94.077203
Santini, P. ; Carretta, S. ; Liviotti, E. ; Amoretti, G. ; Carretta, P. ; Filibian, M. ; Lascialfari, A. ; Micotti, E. / NMR as a probe of the relaxation of the magnetization in magnetic molecules. In: Physical Review Letters. 2005 ; Vol. 94, No. 7.
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