Journal
NANO LETTERS
Volume 12, Issue 4, Pages 1972-1976Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl204510p
Keywords
Nanowires; magnetoresistance; domain wall; depinning field
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Funding
- NSF [0956171]
- NIH, NIH Roadmap for Medical Research [1DP2OD004342-01]
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We report the synthesis of single crystalline Co2Si nanowires and the electrical transport studies of single Co2Si nanowire devices at low temperature. The butterfly shaped magnetoresistance shows interesting ferromagnetic features, including negative magnetoresistance, hysteretic switch fields, and stepwise drops in magnetoresistance. The nonsmooth stepwise magnetoresistance response is attributed to magnetic domain wall pinning and depinning motion in the. Co2Si nanowires probably at crystal or morphology defects. The temperature dependence of the domain wall depinning field is observed and described by a model based on thermally assisted domain wall depinning over a single energy barrier.
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