A spin-wave frequency doubler by domain wall oscillation

TL;DR

This paper introduces a novel spin-wave frequency doubler mechanism using a pinned domain wall oscillating at its eigenfrequency, which radiates spin waves at twice the frequency, demonstrated through micromagnetic simulations.

Contribution

It presents a new method for spin-wave excitation leveraging domain wall oscillation to achieve frequency doubling, advancing spintronic device capabilities.

Findings

Spin waves have twice the frequency of the domain wall oscillation.

The mechanism's characteristics like frequency, wavelength, and velocity are determined.

Oscillation in perpendicular magnetization explains the frequency doubling behavior.

Abstract

We present a new mechanism for spin-wave excitation using a pinned domain wall which is forced to oscillate at its eigenfrequency and radiates spin waves. The domain wall acts as a frequency doubler, as the excited spin waves have twice the frequency of the domain wall oscillation. The investigations have been carried out using micromagnetic simulations and enable the determination of the main characteristics of the excited spin-waves such as frequency, wavelength, and velocity. This behavior is understood by the oscillation in the perpendicular magnetization which shows two anti-nodes oscillating out of phase with respect to each other.