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CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions

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7 Author(s)
H. Sato ; Center for Spintronics Integrated Systems, Tohoku University, Sendai, Japan ; M. Yamanouchi ; K. Miura ; S. Ikeda
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Thermal stability factor Δ of the recording layer was studied in perpendicular anisotropy CoFeB/MgO magnetic tunnel junctions (p-MTJs) with various CoFeB recording layer thicknesses and junction sizes. In all series of p-MTJs with different thicknesses, Δ is virtually independent of the junction sizes of 48-81 nm in diameter. The values of Δ increase linearly as the recording layer thickness increases. The slope of the linear fit is explained well by a model based on nucleation-type magnetization reversal.

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IEEE Magnetics Letters  (Volume:3 )