Fig. 3: Magnetic field dependence of the transmission of an yttrium-iron-garnet/gadolinium-gallium-garnet (YIG/GGG) system at ν = 111 GHz frequency.
From: Magnetic equivalent of electric superradiance in yttrium-iron-garnet films
On the vertical axis, the transmitted light intensity I is shown relative to the GGG substrate’s transmission baseline I0 far from the paramagnetic resonance. The solid orange curve shows the experiment and the dashed green line the fit using the Fresnel equations44. The broad minimum around a magnetic field of 4.0 T corresponds to the paramagnetic resonance in GGG, while the sharp minimum at 4.15 T is due to the ferrimagnetic resonance in YIG. The inset shows the expanded view of this resonance in YIG. The underlying physical processes, namely resonant magnetic absorption and coherent emission, are depicted in the schematic cartoons.
