Current-Induced Resonant Depinning Of A Transverse Magnetic Domain Wall In A Spin Valve Nanostrip

We study the impact of rf and dc currents on domain wall depinning in the soft layer of a 120 nm wide Co/Cu/NiFe spin valve nanostrip. A strong resonant reduction in the depinning field (from similar to 75 to 25 Oe) is observed for rf currents near 3.5 GHz. Notably, the features of the resonant depinning depend not only on the rf current but also on the simultaneously applied dc current. Consequently, we discuss both the role of the adiabatic spin torque at resonance and that of the current generated Oersted fields. (c) 2010 American Institute of Physics. [doi:10.1063/1.3507895]