Luc Thomas, Stuart S. P. Parkin, et al.
Applied Physics Letters
Magnetic domain walls in soft magnetic nanowires often exhibit a structure in which the magnetization curls within the plane of the nanowire around a singular point with out-of-plane magnetization, the vortex core. Although the core is a small object, with a diameter of only 10nm in permalloy, its motion controls the dynamics of the entire wall, which can be several hundred nanometres in size. In particular, when a domain wall trapped at a pinning site is driven out of equilibrium by either a magnetic field or a spin-polarized current, the vortex core gyrates around its equilibrium position. The sense of gyration is determined by the polarity of the core. Here, we show that spin-polarized a.c. currents can resonantly excite a vortex domain wall trapped at a notched site in a nanowire. The shape and magnitude of the resonance, measured from the nanowires resistance, reveal both the elliptical trajectory of the vortex core as well as itspolarity. © 2008 Nature Publishing Group.
Luc Thomas, Stuart S. P. Parkin, et al.
Applied Physics Letters
Stuart S. P. Parkin, Masamitsu Hayashi, et al.
Science
Luc Thomas, Masamitsu Hayashi, et al.
Nature
Kwang-Su Ryu, See-Hun Yang, et al.
Nature Communications