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Giant magnetoresistance in granular Fe SiO2 films

Author

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  • Zhao, B.
  • Yan, X.

Abstract

We studied resistivity, magnetoresistivity and magnetization in granular Fe SiO2 films. In the hopping region, magnetoresistance was found to be as large as −5%, and is isotropic for different measurement geometry, which is the signature of giant magnetoresistance due to a spin-dependent conduction process. Temperature dependence of magnetoresistance could be described qualitatively but not quantitatively by two specific spin-dependent tunnelling models. We found that resistivity ϱ changes five orders of magnitude by altering measurement temperature, annealing temperature or metal volume fraction, and that magnetoresistivity -Δϱ increases with ϱ monotonously.

Suggested Citation

  • Zhao, B. & Yan, X., 1997. "Giant magnetoresistance in granular Fe SiO2 films," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 241(1), pages 367-376.
    • Handle: RePEc:eee:phsmap:v:241:y:1997:i:1:p:367-376
    DOI: 10.1016/S0378-4371(97)00109-X
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