Magnetic and non-magnetic Faraday rotation in ZnMnSe in high magnetic fields

Faraday rotation (FR) spectra over a wide photon energy range were measured in Zn0.985Mn0.015Se by st streak spectrometer using a CCD detector in high magnetic fields. The spectra obtained in the experiment showed a number of unique features. The FR is a rapidly increasing function of held in the lo w field range, but, above a certain critical field, it starts decreasing li nearly, showing a clear turn-around. The turn-around is well explained in t erms of the competition between the paramagnetic and the diamagnetic compon ents of the Faraday rotation in high magnetic fields. This is the first obs ervation of the reversal of the field coefficient of the FR in diluted magn etic semiconductors.