Quenched Slonczewski-Windmill in Spin-Torque Vortex-Oscillators

Abstract

We present a combined analytical and numerical study on double-vortex spin-torque nano-oscillators and describe a mechanism that suppresses the windmill modes. The magnetization dynamics is dominated by the gyrotropic precession of the vortex in one of the ferromagnetic layers. In the other layer the vortex gyration is strongly damped. The dominating layer for the magnetization dynamics is determined by the current polarity. Measurements on Fe/Ag/Fe nano-pillars support these findings. The results open up a new perspective for building high quality-factor spin-torque oscillators operating at selectable, well-separated frequency bands.

References in corpus (4)

• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Current-driven vortex oscillations in metallic nanocontacts
• Excitation of spin dynamics by spin-polarized current in vortex state disks
• Spin-Transfer Torque Induced Vortex Dynamics in Fe/Ag/Fe Nanopillars

Cited by in corpus (5)

• Origin of spectral purity and tuning sensitivity in a vortex-based spin transfer nano-oscillator
• Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source
• Reversal process of a magnetic vortex core under the combined action of a perpendicular field and spin transfer torque
• Improved spectral stability in spin transfer nano-oscillators: single vortex versus coupled vortices dynamics
• Efficient Synchronization of Dipolarly Coupled Vortex-Based Spin Transfer Nano-Oscillators