Ferromagnetic resonance study of polycrystalline Fe_{1-x}V_x alloy thin films

TL;DR

This study uses ferromagnetic resonance to analyze the magnetic properties and magnetization dynamics of polycrystalline Fe-V alloy thin films with varying vanadium content, providing insights into their magnetic behavior.

Contribution

It introduces a broadband FMR method to characterize polycrystalline Fe-V films and compares their properties to epitaxial counterparts, revealing composition-dependent magnetic dynamics.

Findings

Effective demagnetization field varies with V concentration.

Gilbert damping parameter depends on alloy composition.

Polycrystalline films show distinct properties from epitaxial films.

Abstract

Ferromagnetic resonance has been used to study the magnetic properties and magnetization dynamics of polycrystalline Fe$_{1-x}$V$_{x}$ alloy films with $0\leq x < 0.7$. Films were produced by co-sputtering from separate Fe and V targets, leading to a composition gradient across a Si substrate. FMR studies were conducted at room temperature with a broadband coplanar waveguide at frequencies up to 50 GHz using the flip-chip method. The effective demagnetization field $4 \pi M_{\mathrm{eff}}$ and the Gilbert damping parameter $\alpha$ have been determined as a function of V concentration. The results are compared to those of epitaxial FeV films.