Tuning of the microwave magnetization dynamics in CoZr-based thin films by Nd-doping

Abstract

To enhance the damping of microwave magnetization dynamics, we investigate the effect of Nd-doping (0–3.0 at. %) into CoZr thin films. The saturation magnetization decreases with Nd-doping. The coercivities generally decrease in the case of 1.5 at. % Nd-doping, while increase in the case of 3.0 at. % Nd-doping. The magnetization dynamics is characterized with the permeability spectra, which are determined by the ferromagnetic resonance behavior at the microwave range. The permeability spectra are analyzed through the fittings with Landau-Lifshitz-Gilbert equation. From the fittings, both the dynamic magnetic anisotropy field and the damping factor increase, due to the enhanced spin-orbital coupling by Nd-doping.

Reaction diffusion dynamics and the Schryer-Walker solution for domain walls of the Landau-Lifshitz-Gilbert equation

“…The range of physical parameters of ferromagnetic materials where domain walls are observed is wide and, as discussed in [6], it has not been fully explored. Temperature, doping and fabrication techniques allow tailoring of the material parameters which may vary over several orders of magnitude [8][9][10] and such instability may become experimentally accesible in the future [7].…”