Simulation of current-induced microwave oscillation in geometrically confined domain wall

TL;DR

This paper demonstrates that a geometrically confined domain wall can generate microwave oscillations driven by spin-transfer torque when subjected to a dc current, suggesting its potential as a microwave oscillator source.

Contribution

It provides a simulation-based analysis of current-induced microwave oscillations in confined domain walls, highlighting their application potential.

Findings

Domain wall oscillation is driven by spin-transfer torque.

DC current is converted into an AC voltage signal.

Confined domain walls can serve as microwave oscillators.

Abstract

We studied magnetization dynamics of a geometrically confined domain wall under dc current by solving simultaneously the Landau-Lifshitz-Gilbert equation and diffusion equation for spin accumulation. We showed that the oscillation motion of the domain wall is driven by the spin-transfer torque and the dc current is converted to the ac voltage signal. The results means that the geometrically confined domain wall is applicable as a source of microwave oscillator.