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 H-1 nuclear magnetic resonance (NMR) linewidth and H-1 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 Fe3+ 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 Fe3+ moment freezing process, although no quantitative theory of this is currently available.
1H Nuclear Magnetic Resonance and Spin Dynamics in the Tetranuclear Iron(III) cluster {Fe4} / D., Procissi; B. J., Suh; A., Lascialfari; F., Borsa; A., Caneschi; Cornia, Andrea. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - STAMPA. - 91:10(2002), pp. 7173-7175. [10.1063/1.1450790]
1H Nuclear Magnetic Resonance and Spin Dynamics in the Tetranuclear Iron(III) cluster {Fe4}
CORNIA, Andrea
2002
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 H-1 nuclear magnetic resonance (NMR) linewidth and H-1 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 Fe3+ 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 Fe3+ moment freezing process, although no quantitative theory of this is currently available.
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