FARADAY-EFFECT OF CD0.55-YHGYMN0.45TE THIN-FILMS

The energy gap (E(g)) and the Verdet constant were examined for quaternary Cd(0.55-y)Hg(y)Mn0.45Te thin films with y less-than-or-equal-to 0.11. As the Hg content increases, the E(g) decreases and the S-shaped dispersion of the Verdet constant spectrum shifts to a lower photon energy. The magnitude of the Verdet constant for the film with E(g) = 1.78 eV (y = 0.11) is about 1.9 times larger than that for the Cd0.8Mn0.2Te film with E(g) = 1.78 eV. It is thought that the large Faraday effect of the Cd(0.55-y)Hg(y)Mn0.45Te films in the lower-photon-energy region is based on the large Zeeman splitting enhanced by Mn2+, as in the case of ternary Cd(1-x)Mn(x)Te.