Large selective magneto-optic response from magnetic semiconducting layered structures

Magneto-optic (MO) spectra are considered for layered structures consisting of a magnetic semiconductor and a metal and having a resonant state. It is found that scattering on the resonant state results in a large MO response when the difference in resonant frequencies for left and right circular wa ves is large enough. The response is very selective for light waves of a ce rtain helicity, and selection is reversed with magnetization reversal. Nume rical calculations carried out for the Ag/EuS/Ag structure as well as analy tical estimations show that a large selective MO response should be attaina ble experimentally.