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Liquid phase epitaxy of an 18 nm thick Yttrium Iron garnet (YIG) film isachieved. Its magnetic properties are investigated in the 100 -- 400 Ktemperature range, as well as the influence of a 3 nm thick Pt overlayer onthem. The saturation magnetization and the magnetocrystalline cubic anisotropyof the bare YIG film behave similarly to bulk YIG. A damping parameter of onlya few $10^{-4}$ is measured, together with a low inhomogeneous contribution tothe ferromagnetic resonance linewidth. The magnetic relaxation increases upondecreasing temperature, which can be partly ascribed to impurity relaxationmechanisms. While it does not change its cubic anisotropy, the Pt cappingstrongly affects the uniaxial perpendicular anisotropy of the YIG film, inparticular at low temperatures. The interfacial coupling in the YIG/Ptheterostructure is also revealed by an increase of the linewidth, whichsubstantially grows by lowering the temperature.

Temperature Dependence of Magnetic Properties of an 18-nm-thick YIG Film Grown by Liquid Phase Epitaxy: Effect of a Pt Overlayer