Tunable steady-state domain wall oscillator with perpendicular magnetic anisotropy
A. Bisig, O. Boulle, M. Klaui
TL;DR
This paper presents a theoretical study of a tunable steady-state domain wall oscillator with perpendicular magnetic anisotropy, demonstrating frequency control via current and magnetic field, supported by analytical and micromagnetic simulations.
Contribution
It introduces a new concept of a localized steady-state domain wall oscillator with tunable frequency for potential nanoscale microwave applications.
Findings
Oscillation frequency can be tuned by current density.
External magnetic field independently adjusts frequency.
Supported by analytical and micromagnetic simulation results.
Abstract
We theoretically study domain wall oscillations upon the injection of a dc current through a geometrically constrained wire with perpendicular magnetic anisotropy. The oscillation frequency spectrum can be tuned by the injected current density, but additionally by the application of an external magnetic field independent of the power. The results of analytical calculations are supported by micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation. The simple concept of our localized steady-state oscillator might prove useful as a nanoscale microwave generator with possible applications in telecommunication or for rf-assisted writing in magnetic hard drives.
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