Abstract:
We have studied the magnetic and magneto-optical properties of CdS:Mn quantum
dots in polyvinyl alcohol matrix synthesized by co-precipitation method. The size of quantum
dots was estimated by means of absorption spectroscopy. The results of measurements of
magnetic susceptibility as a function of temperature and spectral dependence of the Faraday
rotation of CdS:Mn quantum dots / polyvinyl alcohol composites are presented. In this work
magnetic susceptibility was investigated by Faraday’s method at the temperatures of (78-300)
K in magnetic fields of (0.05-0.8) T. The inverse magnetic susceptibility as a function of
temperature follows a Curie Weiss law. Formation of ferromagnetic coupling between
magnetic ions is supposed. Magneto-optical Faraday rotation has been investigated in the
wavelength region (400-700) nm at temperature 300 K in a magnetic field up to 5 T. Sign of
the Verdet constant is found to be negative.
