Effect of bar width on magnetoresistance of nanoscale nickel and cobalt bars

Yong Qiang Jia, Stephen Y. Chou, Jian Gang Zhu

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16 Scopus citations


The anisotropic magnetoresistance (AMR) of nickel and cobalt bars of 1 μm length, 35 nm thickness, and width varying from 50 to 500 nm is studied. As the bar width is reduced from 500 to 50 nm, longitudinal MR change decreases from 0.8% to 0.2% and transverse MR change increases from 1.3% to 1.8% for the Ni bars: longitudinal MR change is zero and transverse MR change is constant at 1.6% for the Co bars. The zero longitudinal MR is attributed to a single-domain magnetization. The AMR value indicates that the electron scattering from bar edges has little effect on AMR even in a 50 nm width. Furthermore, strong, repeatable Barkhausen noise is observed in the Co bars with a width larger than 200 nm. which can be explained by a micromagnetic model.

Original languageEnglish (US)
Pages (from-to)5461-5463
Number of pages3
JournalJournal of Applied Physics
Issue number8 PART 2B
StatePublished - Apr 15 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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