Effects of eddy currents on retarded modes of antiferromagnets

We investigate retarded modes of noninsulating antiferromagnets with a unia xial anisotropy. The damping caused by the eddy currents and their effects on retarded modes are emphasized. We find that the influences of the eddy c urrents upon the dispersion properties of the surface and bulk; modes are v ery obvious when the wave numbers are not large; and the damping reaches it s maximum at the maximum of the group velocity of the surface mode. The dis persion relations for the surface and bulk modes and the attenuation total reflection are presented numerically. [S0163-1829(99)15401-8].