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 by attenuated total reflection with the uniaxis along an applied magnetic field . 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 and spectra as a consequence of the nonreciprocity of the surface polariton modes when is introduced. We also observe broad dips due to the excitation of bulk modes.
- Received 8 May 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.3756
©1995 American Physical Society