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Resistivity noise in crystalline magnetic nanowires and its implications to domain formation and kinetics

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3 Author(s)
Singh, Amrita ; Department of Physics, Indian Institute of Science, Bangalore 560 012, India ; Chowdhury, Debtosh ; Ghosh, A.

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We have investigated the time-dependent fluctuations in electrical resistance, or noise, in high-quality crystalline magnetic nanowires within nanoporous templates. The noise increases exponentially with increasing temperature and magnetic field, and has been analyzed in terms of domain wall depinning within the Neel–Brown framework. The frequency-dependence of noise also indicates a crossover from nondiffusive kinetics to long-range diffusion at higher temperatures, as well as a strong collective depinning, which need to be considered when implementing these nanowires in magnetoelectronic devices.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 9 )

Date of Publication:

Aug 2009

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