Abstract
This paper refers to investigation of structure, surface morphology, optical parameters and magnetic characteristics of the prepared ZnO thin films when Co concentration varies from 1 to 5 at wt%. X-ray diffraction study revealed that deposited films were poly-crystalline with hexagonal wurtzite structure. The band gap energy was calculated by using the envelope method. It’s value was decreased from 3.334 to 3.22 eV with increasing Co concentration up to 4 at wt% and then increased to 3.335 eV for 5 at wt% Co. The magnetic study indicated a ferromagnetic trend for all thin films. An oxygen vacancies–related F-center is a possible physical mechanism for generation of ferromagnetism. Scanning Electron Microscopy exhibited rough and porous morphology.
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