Resistance fluctuations and 1/f noise in single crystalline Ni nanowires

2009/06/23 by Sudeshna Samanta, Samanta, Sudeshna, M. Venkata Kamalakar +3
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Semiconductor materials and interfaces #Strongly Correlated Electrons (cond-mat.str-el) #Surface and Thin Film Phenomena

paper · pdf · doi:10.48550/arxiv.0906.4227

openalex publication_date 2009/06/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We measured the low frequency (10mHz < f < 10Hz) resistance fluctuations (Noise) in single crystalline ferromagnetic Ni nanowires (diameter ~35nm) in the temperature range 80K-300K. The noise spectral power shows 1/f dependence. The nanowires in an applied magnetic field show negative magetoresistance that saturates for H <= HC. The noise spectral power shows a reduction in low applied field and becomes field independent for H >= HC. This indicates that a part of the observed 1/f noise arises from magnetic origin. The magnetic part is associated with thermally activated domain wall fluctuations that couples to the resistance fluctuations.

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