1H nuclear magnetic resonance and spin dynamics in the tetranuclear iron(III) cluster Fe 4

D. Procissi*, B. J. Suh, A. Lascialfari, F. Borsa, A. Caneschi, A. Cornia

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The spin dynamics of a cluster of four iron(III) ions characterized by a total spin ground state S T=5 and Ising anisotropy have been investigated by the 1H nuclear magnetic resonance (NMR) linewidth and 1H NMR spin-lattice relaxation rate 1/T 1 as a function of the temperature (0.5-295 K) and external magnetic field (0.3-7.2 T). At very low T (0.5 K) the spectrum becomes very broad indicating freezing of the Fe 3+ moments in a superparamagnetic state. The temperature dependence of T 1 -1 and T 2 -1 shows strong field dependent enhancement below 50 K which must be related to the spin dynamics of the Fe 3+ moment freezing process, although no quantitative theory of this is currently available.

Original languageEnglish (US)
Pages (from-to)7173-7175
Number of pages3
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
StatePublished - May 15 2002

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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