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We study theoretically the thermodynamic properties and spin dynamics of aclass of magnetic rings closely related to ferric wheels, antiferromagneticring systems, in which one of the Fe (III) ions has been replaced by a dopantion to create an excess spin. Using a coherent-state spin path integralformalism, we derive an effective action for the system in the presence of amagnetic field. We calculate the functional dependence of the magnetization andtunnel splitting on the magnetic field and show that the parameters of the spinHamiltonian can be inferred from the magnetization curve. We study the spindynamics in these systems and show that quantum tunneling of the Neel vectoralso results in tunneling of the total magnetization. Hence, the spincorrelation function shows a signature of Neel vector tunneling, and electronspin resonance (ESR) techniques or AC susceptibility measurements can be usedto measure both the tunneling and the decoherence rate. We compare our resultswith exact diagonalization studies on small ring systems. Our results can beeasily generalized to a wide class of nanomagnets, such as ferritin.Comment: 15 pages, 5 figure

Thermodynamics and spin-tunneling dynamics in ferric wheels with excess spin