Spin dynamics and frequency dependence of magnetic damping study in soft ferromagnetic FeTaC film with a stripe domain structure

TL;DR

This study investigates the spin dynamics and magnetic damping in soft ferromagnetic FeTaC films with stripe domains, analyzing frequency-dependent damping and resonance behavior to inform magnetic device applications.

Contribution

It provides a detailed analysis of the frequency dependence of magnetic damping and resonance properties in FeTaC films with stripe domains, using a comprehensive experimental and numerical approach.

Findings

The Landé g-factor is estimated at 2.1.

The PMA constant is approximately 2×10^5 erg/cm^3.

The Gilbert damping parameter α is about 0.006 at 10 GHz.

Abstract

Perpendicular magnetic anisotropy (PMA) and low magnetic damping are the key factors for the free layer magnetization switching by spin transfer torque technique in magnetic tunnel junction devices. The magnetization precessional dynamics in soft ferromagnetic FeTaC thin film with a stripe domain structure was explored in broad band frequency range by employing micro-strip ferromagnetic resonance technique. The polar angular variation of resonance field and linewidth at different frequencies have been analyzed numerically using Landau-Lifshitz-Gilbert equation by taking into account the total free energy density of the film. The numerically estimated parameters Land\'{e} $g$-factor, PMA constant, and effective magnetization are found to be 2.1, 2$\times10^{5}$ erg/cm$^{3}$ and 7145 Oe, respectively. The frequency dependence of Gilbert damping parameter ($\alpha$) is evaluated by considering both intrinsic and extrinsic effects into the total linewidth analysis. The value of $\alpha$ is found to be 0.006 at 10 GHz and it increases with decreasing precessional frequency.