Giant magnetoresistance in granular ferromagnetic systems of Ni3Mn alloy

Teiko Okazaki, Satoshi Sugimoto, Yoshinori Aono, Takafumi Miyanaga, Motofumi Homma

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1 Citation (Scopus)


Giant magnetoresistance (GMR) phenomena were investigated in the inhomogencous phase of NisMn alloy, where magnetically ordered single-domain clusters are distributed in a disordered nonmagnetic matrix. The observed GMR varies with the long-range-order parameter S and has values ranging from -0.5% to -1.8% for 0.1 < S < 0.5. The GMR is proportional to [1 -(M/Ms)2] with an applied magnetic field, where M and Ms are the global and saturation magnetizations, respectively. We found that the GMR is correlated with the average size (in) and the volume fraction e of the ferromagnetic clusters. The GMR is maximized at (m) ∼ 33 and ε ∼ 0.25, these values being obtained from analysis using a superferromagnetic model.

Original languageEnglish
Pages (from-to)5071-5074
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number9 A
Publication statusPublished - 1999
Externally publishedYes


  • Cluster size
  • Giant magnetoresistance
  • Inhomogeneous phase
  • Magnetic analysis
  • NiMn

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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