Abstract
Detailed behavior of abrupt magnetoresistance (MR) jumps in Ni nanowires, embedded into nanoporous alumina membranes, is reported. The observed abrupt elimination of the MR hysteresis by the MR jump indicates an abrupt motion and emission of magnetic domain walls (DWs) from the wires. We find that the temperature dependence of the inverse of the normalized jump magnitude shows a behavior similar to that of the thermal escape and macroscopic quantum tunneling (MQT) rates in Josephson junctions. We also find that the MR jump is sensitive to wire diameters. These observations can be evidence for MQT of magnetic DWs. The presence of a possible weak localization is revealed in the Ni wire, from the logarithmic temperature and magnetic-field dependence of conductance. It should be implied that this weak localization is independent of the MR jump.
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