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We report observations of the gyrotropic change in magnetic susceptibility ofthe Fe$^{3+}$ electron paramagnetic resonance at 12.037GHz (between spin states$|1/2>$ and $|3/2>$) in sapphire with respect to applied magnetic field.Measurements were made by observing the response of the high-Q WhisperingGallery doublet (WGH$_{\pm17,0,0}$) in a Hemex sapphire resonator cooled to 5K. The doublets initially existed as standing waves at zero field and weretransformed to traveling waves due to the gyrotropic response.

physical review. b, condensed matter and materials physics

Creating traveling waves from standing waves from the gyrotropic  paramagnetic properties of Fe$^{3+}$ ions in a high-Q whispering gallery mode  sapphire resonator