Giant magnetoresistance and high sensitivity in annealed NiFeCo/Ag multilayers

J. W. Dykes, Young-geun Kim, A. Tsoukatos, S. Gupta, S. C. Sanders

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Abstract

We report giant magnetoresistance in annealed NiFeCo (2 nm)/Ag (3.3 nm) multilayers. For all samples, post-deposition annealing was necessary for the observation of GMR analogous to the NiFe/Ag discontinuous multilayer system. The GMR ratio and field sensitivity varied widely as a function of annealing from temperatures between 300 and 400 °C. A high MR ratio of 6.3% and field sensitivity of 11.3%/(kA/m) (0.9%/Oe) were observed for a seven bilayer sample annealed to 350 °C. In general, NiFeCo/Ag multilayers produced greater MR responses and field sensitivities than comparably annealed NiFe/Ag multilayers. NiFeCo/Ag multilayers, however, display more hysteresis than NiFe/Ag multilayers and lack a zero-crossing saturation magnetostriction versus annealing temperature. Multilayer deposition in a magnetic field severely degrades MR performance since it prevents the magnetostatic antiparallel alignment between magnetic grains which occurs in the absence of an applied magnetic field following sample annealing.

Original languageEnglish
Pages (from-to)5584-5586
Number of pages3
JournalJournal of Applied Physics
Volume79
Issue number8 PART 2A
Publication statusPublished - 1996 Apr 15
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Dykes, J. W., Kim, Y., Tsoukatos, A., Gupta, S., & Sanders, S. C. (1996). Giant magnetoresistance and high sensitivity in annealed NiFeCo/Ag multilayers. Journal of Applied Physics, 79(8 PART 2A), 5584-5586.