Yttrium iron garnet $(\mathrm{YIG}, {\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12})$ is a leading ferrimagnetic oxide for spintronic and magnonic applications due to its low magnetic damping and efficient spin transport via magnons. We investigate in-plane angular-dependent magnetic properties and interfacial effects in 104-nm-thick YIG films grown on gadolinium gallium garnet (GGG, ${\mathrm{Gd}}_3{\mathrm{Ga}}_5{\mathrm{O}}_{12}$) substrates using vibrating sample magnetometry (VSM), AC susceptibility, and ferromagnetic resonance (FMR) from 2 K to 300 K. FMR measurements (1–15 GHz) reveal a nonmonotonic temperature dependence of the resonance field $\left(H_{\mathrm{res}}\right)$, which decreases near 50 K and increases at lower temperatures. This behavior, along with clear magnetic phase changes near 20 K observed in VSM/AC magnetic susceptability (ACMS) data, is attributed to enhanced interfacial spin dynamics driven by the increasing paramagnetism of GGG at low temperatures. The damping constant $\left(\alpha \right)$ exhibits strong in-plane angular dependence $(\alpha \approx {10}^{-3}\text{–}{10}^{-2})$ below 50 K, indicating sensitivity to interfacial coupling and local defects. Our findings highlight the critical role of substrate-induced interfacial effects and magnetic anisotropy in determining YIG's low-temperature magnetic behavior, with important implications for future spintronic device design.

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• Ferrimagnetism
• Grain boundaries
• Impurities
• Magnetic interactions
• Paramagnetism
• Surface & interfacial phenomena
• Ferrimagnets
• Magnetic insulators
• Paramagnets
• Dilution refrigerator
• Ferromagnetic resonance
• Magnetization measurements
• Susceptibility measurements