Room Temperature Ferromagnetism in Cr‐doped ZnS Nanoparticles

摘要

Cr‐doped ZnS nanoparticles with Cr concentration of 2 atm.% were successfully synthesized by the chemical co‐precipitation method using 2‐mercapto ethanol as the capping agent. The structural, optical characteristics and magnetic properties of the prepared samples were studied. Energy Dispersive spectroscopy (EDS) measurements showed the existence of Cr ion in the Cr doped ZnS. No mixed phase was observed from X‐ray diffraction (XRD) studies and all the peaks were indexed to the cubic phase of ZnS. The diameter is in the range of 5-10 nm, it was confirmed by TEM studies. The photoluminescence spectra of all the samples exhibited a broad emission band located around 435 nm. The luminescence intensity decreased by doping Cr. The magnetic behavior of the nanoparticles for Cr doped ZnS was investigated using a vibrating sample magnetometer (VSM). We determined the magnetic parameters such as saturation magnetization (M_S), coercivity (H_C) and retentivity (M_R) with Cr concentration from M‐H loop.