Domain wall motion in ultrathin Co70Fe30/Pd multilayer nanowires with perpendicular anisotropy

We report the investigation of spin polarized current induced domain wall (DW) displacement in the perpendicularly magnetized nanowires patterned on ultrathin CoFe/Pd multilayer films by anomalous Hall-effect measurement. We find that DWs can be driven to propagate in the nanowire by the threshold c...

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Bibliographic Details
Published in:Journal of applied physics 2016-02, Vol.119 (8)
Main Authors: Meng, Zhaoliang, He, Shikun, Qiu, Jinjun, Zhou, Tiejun, Han, Guchang, Teo, Kie-Leong
Format: Article
Language:English
Subjects:
Adiabatic flow
Anisotropy
Applied physics
Dependence
Domain walls
Hall effect
Multilayers
Nanowires
Pulsed current
Threshold currents
Torque
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Summary:We report the investigation of spin polarized current induced domain wall (DW) displacement in the perpendicularly magnetized nanowires patterned on ultrathin CoFe/Pd multilayer films by anomalous Hall-effect measurement. We find that DWs can be driven to propagate in the nanowire by the threshold current density (Jth) as low as 5.2 × 1010 A/m2 under a bias field H = 115 Oe. The spin-torque efficiency ε = (1.68 ± 0.09) × 10−14 T·m2/A is derived by measuring the effective field (HJ) generated by the pulsed current as well as through the dependency of Jth on H from the DW depinning field experiment. Our result indicates that the current induced DW motion is essentially dominated by the non-adiabatic spin transfer torque effect and the non-adiabaticity factor β is estimated to be as high as 0.96 ± 0.04.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4942622