Abstract
The temperature dependence (4.2–300 K) of ferromagnetic resonance (FMR) in the 3-cm range in films of yttrium-iron garnet (YIG)1.7–3 μm thick, epitaxially grown on a paramagnetic gadolinium-gallium garnet (GGG) paramagnetic substrate is studied. It is found that with decrease in temperature, beginning at T ≃ 70 K, the temperature dependences of the resonant FMR fields res ‖ and res ∥ for magnetic fields applied parallel and perpendicular to the normal to the film deviate from similar dependences for a free thin YIG plate, which approach the value of ω/γ for YIG. This deviation increases approximately in proportion to T−1, reaching hundreds of Oe at T=4.2 K. It is established that the given effect is related to the additional static magnetic field ΔHp created in the YIG film by the paramagnetic substrate, and is dependent on the form of the latter.
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