crystal YIG (Y 3 Fe 5 O 12) film grown on GGG substrate. In order to obtain magnonic
crystals, unlike the conventional methods, the surface of YIG films were magnetically
modulated by magnet array in one and two-dimensions. The surface modulated YIG films
formed sharp band gaps at approximately 6.55 GHz and 6.58 GHz at 1600 Oe magnetic field
for one and two-dimensional magnonic crystals, respectively. It was found that a very small …