Abstract
A microscopic theory for ultrasmall ferromagnetic double tunnel junctions is proposed, which selfconsistently describes the higher order tunneling processes as well as the charged states of the islands for arbitrary environmental impedance. Such a theory is indispensable to understanding of the physics of this system, since stability of Coulomb blockade here is strongly dependent on applied magnetic field. Tunneling currents and enhancement of negative magnetoresistance due to the Coulomb blockade are briefly discussed.
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