Mrf. Jensen et al., EXPERIMENTAL-OBSERVATION OF MAGNETIC SURFACE-POLARITONS IN FEF2 BY ATTENUATED TOTAL-REFLECTION, Physical review letters, 75(20), 1995, pp. 3756-3759
We present the first direct experimental evidence for the existence of
magnetic surface polaritons in a uniaxial antiferromagnet. The modes
are excited in FeF2 by attenuated total reflection with the uniaxis al
ong an applied magnetic field H-o. The resonance is observed as an att
enuation of the reflected intensity as the frequency of the far-infrar
ed beam is scanned. We find nonreciprocity between the +H-o and -H-o s
pectra as a consequence of the nonreciprocity of the surface polariton
modes when H-o is introduced. We also observe broad dips due to the e
xcitation of bulk modes.