Non-uniformity of a planar polarizer as a reason of spin-transfer induced vortex oscillations at zero field

TL;DR

This paper proposes that non-uniform planar polarizers can induce large-amplitude vortex oscillations in spin-valve nanostructures at zero magnetic field, with efficiency depending on the polarizer's magnetization distribution.

Contribution

It introduces a mechanism where non-uniform planar polarizers excite vortex oscillations, highlighting the importance of the polarizer's magnetization distribution for efficient excitation.

Findings

Non-uniform planar polarizers can induce vortex oscillations.

Circular magnetization distribution optimizes excitation efficiency.

Oscillation conditions depend on vortex chirality, not core direction.

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.