Abstract
We present the first direct experimental evidence for the existence of magnetic surface polaritons in a uniaxial antiferromagnet. The modes are excited in Fe${\mathrm{F}}_{2}$ by attenuated total reflection with the uniaxis along an applied magnetic field ${H}_{0}$. The resonance is observed as an attenuation of the reflected intensity as the frequency of the far-infrared beam is scanned. We find nonreciprocity between the $+{H}_{0}$ and $\ensuremath{-}{H}_{0}$ spectra as a consequence of the nonreciprocity of the surface polariton modes when ${H}_{0}$ is introduced. We also observe broad dips due to the excitation of bulk modes.
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