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• W2030397003 abstract "We investigated the effect of nonstoichiometry on the half-metallic character of the Heusler alloy Co${}_{2}$MnSi (CMS) through the Mn composition (ensuremath{alpha}) dependence of the saturation magnetization per formula unit (${ensuremath{mu}}_{s}$) of Co${}_{2}$Mn${}_{ensuremath{alpha}}$Si${}_{ensuremath{beta}}$ thin films and the tunneling magnetoresistance (TMR) ratio of CMS/MgO/CMS magnetic tunnel junctions (CMS MTJs) having Co${}_{2}$Mn${}_{ensuremath{alpha}}$Si${}_{ensuremath{beta}}$ electrodes. As a basis for understanding the effect of nonstoichiometry in CMS, we developed a generalized form of the site-specific formula unit (SSFU) composition model, which assumes the formation of only antisite defects, not vacancies, to accommodate nonstoichiometry. The ensuremath{alpha} dependence of ${ensuremath{mu}}_{s}$ was well explained by density functional calculations with the coherent potential approximation based on the SSFU composition model for ensuremath{alpha} up to a certain critical value (${ensuremath{alpha}}_{c}$)>1.0. The ${ensuremath{mu}}_{s}$ data for Mn-deficient films deviated from the Slater-Pauling predicted data for half-metals due to Co atoms at the nominal Mn sites (Co${}_{mathrm{Mn}}$). The theoretical spin polarizations, obtained from only the $s$- and $p$-orbital components, ${P}_{mathrm{th}}$($sp$), were found to qualitatively explain the ensuremath{alpha} dependence of the TMR ratio except for ensuremath{alpha} > ${ensuremath{alpha}}_{c}$. This is in contrast to the theoretical spin polarizations obtained from the $s$-, $p$-, and $d$-orbital components, ${P}_{mathrm{th}}$(spd). A decrease in the TMR ratio observed for CMS MTJs having Mn-deficient electrodes was ascribed to small $s$- and $p$-orbital components of the local density of minority-spin in-gap states at the Fermi level that appeared for both antisite Co${}_{mathrm{Mn}}$ atoms and Co atoms at the regular sites." @default.
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• W2030397003 date "2014-01-30" @default.
• W2030397003 modified "2023-10-16" @default.
• W2030397003 title "Effect of nonstoichiometry on the half-metallic character of Co<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>MnSi investigated through saturation magnetization and tunneling magnetoresistance ratio" @default.
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• W2030397003 doi "https://doi.org/10.1103/physrevb.89.014428" @default.
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