Abstract
The magneto-optical effect in dilute magnetic semiconductors (DMSs) is directly related tothe interaction between the d electrons of the transition metal ions and the s, p electrons ofthe host semiconductor. We show the advantages of the magneto-optical effectof DMSs as regards fabricating magneto-optical waveguide devices that can beintegrated with other semiconductor optical devices. We also discuss the advantages ofmagneto-optical spectroscopy for characterizing DMSs. Intrinsic ferromagnetism ofIn1−xMnxAs,Ga1−xMnxAs andZn1−xCrxTe isconfirmed by using magnetic circular dichroism (MCD) spectroscopy. The MCD analyses also show thatZn1−xTMxO (TM = Mn, Fe, Co,Ni or Cu), Ga1−xMnxN and Ga1−xCrxAs are paramagnetic DMSs with the s, p–d exchange interaction. Ferromagnetic behavioursobserved in some transition metal doped ZnO, GaN and GaAs samples are attributed tounidentified precipitations not detectable by means of x-ray diffraction analysis.
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