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Structural and Magnetic Properties of Co₂MnSi Heusler Alloy Films
W. C. Lim,S. Okamura,N. Tezuka,K. Inomata,J. Y. Bae,H. J. Kim,T. W. Kim,T. D. Lee 한국자기학회 2006 Journal of Magnetics Vol.11 No.1
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, CO₂MnSi 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 CO₂MnSi Heusler alloy films were investigated. TMR characteristics of magnetic tunnel junctions with a CO₂MnSi/SiO₂/CoFe structure were studied. A maximum MR ratio of 39% with SiO₂ 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 CO₂MnSi electrode together with oxidation of the electrode layer.