Effects of Fe and Co addition on the magnetoresistance in Ni-Mn-Ga films

  • K. KoikeEmail author
  • M. Ohtsuka
  • M. Matsumoto
  • Y. Adachi
  • T. Takagi
  • H. Kato


Effects of Fe and Co addition on the magnetoresistance MR were investigated in sputtered Ni-Mn-Ga-M (M = Fe, Co) films. With increasing M content, magnetization σ enhanced for M = Fe, while it reduced for M = Co. At 300 K, absolute MR value at 1.5 T |MR|1.5 was about 1%. The value of |MR|1.5 was found to be decreased with increasing M = Fe content. In the case of M = Co, |MR|1.5 increased with M content. |MR|1.5 of the film containing Co 1.6 at.% showed a maximum value of 2.5% at 355 K in the vicinity of the Curie temperature TC. An origin of MR behavior in the present films was suggested to be explained by a s-d scattering model.


Curie Temperature Martensitic Transformation European Physical Journal Special Topic Martensitic Transformation Temperature Reverse Martensitic Transformation 
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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  • K. Koike
    • 1
    Email author
  • M. Ohtsuka
    • 2
  • M. Matsumoto
    • 3
  • Y. Adachi
    • 1
  • T. Takagi
    • 3
  • H. Kato
    • 1
    • 4
  1. 1.Graduate School of Science and Engineering, Yamagata UniversityYamagataJapan
  2. 2.Institute of Multidisciplinary Research for Advanced Materials, Tohoku UniversityMiyagiJapan
  3. 3.Institute of Fluid Science, Tohoku UniversityMiyagiJapan
  4. 4.New Industry Creation Hatchery Center, Tohoku UniversityMiyagiJapan

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