Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Structural and Magnetic Properties of Co2MnSi Heusler Alloy Films

  • Lim, W.C. (Department of Materials Science and Engineering, KAIST) ;
  • Okamura S. (Department of Materials Science, Tohoku University) ;
  • Tezuka N. (Department of Materials Science, Tohoku University, CREST, Japan Science and Technology Agency) ;
  • Inomata K. (Department of Materials Science, Tohoku University, CREST, Japan Science and Technology Agency) ;
  • Bae, J.Y. (Department of Materials Science and Engineering, KAIST) ;
  • Kim, H.J. (Department of Materials Science and Engineering, KAIST) ;
  • Kim, T.W. (Device Lab., SAIT) ;
  • Lee, T.D. (Department of Materials Science and Engineering, KAIST)
  • Published : 2006.03.01
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Abstract

Recently half-metallic full-Heusler alloy films have attracted significant interests for spintronics devices. As these alloys have been known to have a high spin polarization, very large TMR ratio is expected in magnetic tunnel junctions. Among these alloys, $Co_2MnSi$ full-Heusler alloy with a high spin polarization and a high Curie temperature is considered a good candidate as an electrode material for spintronic devices. In this study, the magnetic and structural properties of $Co_2MnSi$ Heusler alloy films were investigated. TMR characteristics of magnetic tunnel junctions with a $Co_2MnSi/SiO_2/CoFe$ structure were studied. A maximum MR ratio of 39% with $SiO_2$ substrates and 27% with MgO(100) substrates were obtained. The lower MR ratio than expectation is considered due to off-stoichiometry and atomic disorder of $Co_2MnSi$ electrode together with oxidation of the electrode layer.

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References

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