Studies on ZnS based Room Temperature Ferromagnetic DMS Nanoparticles

In order to make spintronics practically viable it is important to explore magnetic semiconductors which are ferromagnetic at or above room temperature. There have been many reports on RTFM particularly of wide-gap semiconductors doped with 3d transition-metal ions. Zn chalcogenides are important host materials which are known to support RTFM. ZnSe and ZnTe doped with Mn Fe Co Ni and Cr have been investigated. ZnS with a wide band gap (3.68 eV) has a great potential for device applications and has been identified as an excellent host semiconductor for supporting RTFM when doped with a variety of 3d transition metal ions such as Mn Co Cu and Fe. Surprisingly inspite of both applied and academic interests Cr-doped ZnS in nano form has been least studied. In fact as per literature there are only a few reports on structural and optical properties of Cr-doped ZnS and no reports on magnetic studies. In view of these factors Cr has been chosen as the dopant for the present investigation.