Non-uniformity of a planar polarizer as a reason of spin-transfer induced vortex oscillations at zero field
arXiv:1003.0303 · doi:10.1063/1.3441405
Abstract
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.
4 pages, 1 figure
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