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arXiv · 2109.12071

Damping in yttrium iron garnet film with an interface

Ravinder Kumar·B. Samantaray·Shubhankar Das·Kishori Lal·D. Samal·Z. Hossain
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Abstract

We report strong damping enhancement in a 200 nm thick yttrium iron garnet (YIG) film due to spin inhomogeneity at the interface. The growth-induced thin interfacial gadolinium iron garnet (GdIG) layer antiferromagnetically (AFM) exchange couples with the rest of the YIG layer. The out-of-plane angular variation of ferromagnetic resonance (FMR) linewidth $ΔH$ reflects a large inhomogeneous distribution of effective magnetization $Δ4 πM_{eff}$ due to the presence of an exchange springlike moments arrangement in YIG. We probe the spin inhomogeneity at the YIG-GdIG interface by performing an in-plane angular variation of resonance field $H_{r}$, leading to a unidirectional feature. The large extrinsic $Δ4πM_{eff}$ contribution, apart from the inherent intrinsic Gilbert contribution, manifests enhanced precessional damping in YIG film.

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Ravinder Kumar, B. Samantaray, Shubhankar Das, Kishori Lal, D. Samal, Z. Hossain. 2021-09-24. Damping in yttrium iron garnet film with an interface. https://doi.org/10.1103/physrevb.106.054405

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