We discuss a possible mechanism of the spin-transfer induced oscillations of a vortex in the free layer of spin-valve nanostructures, in which the polarizer layer has a planar magnetization. We demonstrate that if such planar polarizer is essentially non-uniform, steady gyrotropic vortex motion with large amplitude can be excited. The best excitation efficiency is obtained for a circular magnetization distribution in the polarizer. In this configuration, the conditions for the onset of the oscillations depend on the vortex chirality but not on the direction of its core.
@article{arxiv.1003.0303,
title = {Non-uniformity of a planar polarizer as a reason of spin-transfer induced vortex oscillations at zero field},
author = {A. V. Khvalkovskiy and J. Grollier and N. Locatelli and Ya. V. Gorbunov and K. A. Zvezdin and V. Cros},
journal= {arXiv preprint arXiv:1003.0303},
year = {2015}
}