Mechanism of anomalously large magnetoresistance in nanosized tunnel contacts

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We observed anomalously large magentoresistance in nanosized tunnel contacts formed by a nanoprober system. In this study, three possible mechanisms for the observed phenomenon were examined: the formation of a nanostructure by a large electric field between probe and thin film, a novel magnetotransport phenomenon, and the deformation of the prober system. An experimental result suggesting that atoms migrates by the scanning of the probe on the thin film was obtained, although it was not conclusive.