Magnetostatic propagation in thin films of liquid phase epitaxy YIG

Magnetostatic surface wave (MSSW) propagation loss and ferrimagnetic resonance linewidth of thin films of liquid phase epitaxy yttrium iron garnet were measured in the frequency range 2 to 9 GHz. With increasing frequency, both the loss and linewidth initially decreased to a minimum value at about 3 GHz and thereafter increased linearly with frequency. The measurements are in agreement with recent predictions of Vittoria and Wilsey; namely, there is a direct correspondence between MSSW propagation loss and magnetic damping at all frequencies.