Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2998393
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- French National Research Agency (ANR)
- MAGLOG of C'NANO Ile de France
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Spatial and time resolved giant magnetoresistance measurements are used to detect thermally activated domain wall (DW) propagation along wires formed from spin valves having perpendicular magnetic anisotropy. We show that field- and current-induced DW propagation are both strongly influenced by the presence of pinning defects. As a result, the creep motion of DWs over macroscopic length scales is found to be stochastic. Only the combination of a high polarized current density and/or magnetic field allows DWs to propagate freely. These results may help explain low current-driven DW velocities observed in previous experiments. (c) 2008 American Institute of Physics. [DOI: 10.1063/1.2998393]
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