The interplay of large two-magnon ferromagnetic resonance linewidths and low Gilbert damping in Heusler thin films

Abstract

We report on broadband ferromagnetic resonance linewidth measurements performed on epitaxial Heusler thin films. A large and anisotropic two-magnon scattering linewidth broadening is observed for measurements with the magnetization lying in the film plane, while linewidth measurements with the magnetization saturated perpendicular to the sample plane reveal low Gilbert damping constants of $(1.5\pm 0.1)\times 10^{-3}$, $(1.8\pm 0.2)\times 10^{-3}$, and $<8\times 10^{-4}$ for Co${}_2$MnSi/MgO, Co${}_2$MnAl/MgO, and Co${}_2$FeAl/MgO, respectively. The in-plane measurements are fit to a model combining Gilbert and two-magnon scattering contributions to the linewidth, revealing a characteristic disorder lengthscale of 10-100 nm.

8 pages, 5 figures

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Cited by in corpus (6)

• Magnetic Damping in Epitaxial Fe Alloyed with Vanadium and Aluminum
• Room-Temperature Intrinsic and Extrinsic Damping in Polycrystalline Fe Thin Films
• Magnetoelastic Gilbert damping in magnetostrictive Fe${}_{0.7}$Ga${}_{0.3}$ thin films
• Spin pumping in d-wave superconductor/ferromagnet hybrids
• Magnetodynamic properties of dipole-coupled 1D magnonic crystals
• Two-magnon frequency-pulling effect in ferromagnetic resonance