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Observation of a fluctuation-enhanced magnetoresistance in Ni81Fe19 /Ag multilayers at high current density



Charles T. Rogers, L S. Kirschenbaum, P D. Beale, Stephen E. Russek, S. Sanders


We report a correlation between peaks observed in the resistance versus applied magnetic field and low frequency resistance noise for Ni81Fe19/Ag giant magnetoresistance systems with dc bias current density above 106 A/cm2. The magnetic noise has a 1/f-like spectrum and arises from time-dependent magnetic orientational fluctuations within the multilayer. The noise amplitude is strongly correlated with the observed magnetoresistance peaks. The data and a simple model for the fluctuations demonstrate the important role of fluctuations in determining magnetoresistance in such multilayer systems.
Physical Review B


Rogers, C. , Kirschenbaum, L. , Beale, P. , Russek, S. and Sanders, S. (1997), Observation of a fluctuation-enhanced magnetoresistance in Ni<sub>81</sub>Fe<sub>19</sub> /Ag multilayers at high current density, Physical Review B, [online], (Accessed July 18, 2024)


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Created September 30, 1997, Updated October 12, 2021