Ferromagnetic resonance linewidth mechanisms in annealed CoFeSiB glass-covered microwires

Abstract

Magnetic relaxation of CoFeSiB glass-covered microwire under applied stress and Joule heating annealing was investigated by ferromagnetic resonance (FMR) linewidth experiments. We were able to identify the main damping mechanisms and to quantify these damping terms, showing the effect of annealing and applied stress on the damping terms. The study has shown that there are three main damping mechanisms responsible for the FMR linewidth: the Gilbert damping parameter, a damping mechanism due to anisotropy dispersions and two-magnon scattering. The Gilbert damping parameter is constant and not influenced by annealing and stress. The FMR linewidth is very sensitive to anisotropy dispersions and this mechanism has a considerable contribution to magnetic relaxation. The two-magnon scattering is an assignment of the inhomogeneities present in the samples.

Engineering of Magnetic Softness and Domain Wall Dynamics of Fe-rich Amorphous Microwires by Stress- induced Magnetic Anisotropy

“…However, as reported 51 α in amorphous microwires does not depend on annealing. Therefore, internal stresses relaxation can affect β r through K me .…”

A study on the thickness dependence of static and dynamic magnetic properties of Ni81Fe19 thin films

“…As each contribution to the linewidth present a different evolution with the applied field intensity or field angle, it is possible to evaluate the contribution from each one to the total linewidth [30,31].…”

The contributions of intrinsic damping and two magnon scattering on the ferromagnetic resonance linewidth in [Fe65Co35/SiO2]n multilayer films

“…As reported in Ref. [21], the intrinsic damping originates from the spin-orbital coupling, and according to the LLG equation, the intrinsic linewidth f INT will increase linearly with the increasing H b [9]. Hence, the extrinsic linewidth f EXT must decreases more sharply than f INT .…”

“…Up to now, there are lots of published theoretical and experimental results on the microwave damping mechanism of magnetic materials [5][6][7][8][9][10][11][12][13]. More attentions have been paid to the damping in the single-layer nano-granular magnetic film [10,11], magnetic * Corresponding author.…”