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Impurity-limited quantum transport variability in magnetic tunnel junctions

We report an extensive first-principles investigation of impurity-induced device-to-device variability of spin-polarized quantum tunneling through Fe/MgO/Fe magnetic tunnel junctions (MTJ). In particular, we calculated the tunnel magnetoresistance ratio (TMR) and the average values and variances of the currents and spin transfer torque (STT) of an interfacially doped Fe/MgO/Fe MTJ. Further, we predicted that N-doped MgO can improve the performance of a doped Fe/MgO/Fe MTJ. Our first-principles calculations of the fluctuations of the on/off currents and STT provide vital information for future predictions of the long-term reliability of spintronic devices, which is imperative for high-volume production.

preprint2016arXivOpen access
Jianing ZhuangYin WangYan ZhouJian WangHong Guo
cond-mat.mes-hallphysics.comp-ph
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Jianing ZhuangYin WangYan ZhouJian WangHong Guo

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