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Magnetoresistance of Arrays of Magnetic Nanowires

One serious problem with exploitation of the giant magnetoresistance effect (GMR) in magnetic layered structures for a geometry with the current flowing perpendicular to the planes of the structure is that the total resistance is far too low to be measurable by conventional means. This problem does not arise for a two-dimensional array of alternating magnetic and non-magnetic nanowires (see the figure) whose thickness is of the order of a few interatomic distances. Such arrays with wires only one or few atoms thick can be now prepared experimentally. We have calculated the GMR for two-dimensional ordered, as well as disordered, arrays of magnetic nanowires. PRB 57, 3474 (1998).