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We present an experimental and theoretical study of the low-field dynamics ofcurrent-driven vortex oscillations in nanocontacts based on spin-valvemultilayers. These oscillations appear as low-frequency (250-500 MHz)excitations in the electrical power spectrum which arise from to variations inthe giant-magnetoresistance. We show that the vortex oscillations, oncenucleated at large fields applied perpendicular to the film plane, persist atzero applied magnetic fields. Some training effects on the oscillationfrequency and linewidth also observed for small in-plane magnetic fields.

Current-driven vortex oscillations in metallic nanocontacts: Zero-field oscillations and training effects