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

doi:10.1063/1.1450790

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

Radiology

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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 language	English (US)
Pages (from-to)	7173-7175
Number of pages	3
Journal	Journal of Applied Physics
Volume	91
Issue number	10 I
DOIs	https://doi.org/10.1063/1.1450790
State	Published - May 15 2002

ASJC Scopus subject areas

Physics and Astronomy(all)

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

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.",

author = "D. Procissi and Suh, {B. J.} and A. Lascialfari and F. Borsa and A. Caneschi and A. Cornia",

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T1 - 1H nuclear magnetic resonance and spin dynamics in the tetranuclear iron(III) cluster Fe 4

AU - Procissi, D.

AU - Suh, B. J.

AU - Lascialfari, A.

AU - Borsa, F.

AU - Caneschi, A.

AU - Cornia, A.

PY - 2002/5/15

Y1 - 2002/5/15

N2 - 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.

AB - 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.

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IS - 10 I

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

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