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Experimental Study of Thermally Activated Magnetization Reversal With a Spin-Transfer Torque in a Nanowire

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8 Author(s)
Seon Ock Kim ; Dept. of Mater. Sci. & Eng., KAIST, Daejeon ; Woo Jin Kim ; Kab-Jin Kim ; Sug-Bong Choe
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The current-induced domain-wall depinning in ferromagnetic nanowires with perpendicular magnetic anisotropy is investigated. The nanowire patterns with 500-nm width are fabricated from 8-nm-thick Co-Re-Pt alloy films on 1-nm-thick Ta underlayer. By injecting the current into the nanowire, the domain wall motion via depinning from extrinsic structural pinning sites is observed. The depinning time ranging over 1 mus-1 s is found to be exponentially dependent on the current density. Based on generalized Neel-Brown formula, the slope of the exponential dependence is analyzed to estimate the depinning energy barrier as a function of the current density under a constant bias magnetic field.

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IEEE Transactions on Magnetics  (Volume:44 ,  Issue: 11 )