Room temperature ferromagnetism in swift heavy ion irradiated V doped ZnO thin films

摘要

In the present study, we have investigated the effect of 50 MeV Ag-ions irradiation on structural, optical and magneticproperties of pure ZnO, Znsub0.95/subVsub0.05/subO and Znsub0.90/subVsub0.10/subO thin films. X-ray diffraction (XRD) analysis of the films before andafter ion irradiation confirms that all the films are in (002) preferred orientation. Upon ion irradiation, the increase offull width at half maximum (FWHM) and decrease of XRD intensity of (002) diffraction peak are observed.Photoluminescence (PL) spectra of ion irradiated films exhibit strong defect related emission about ~2.45 eV. It might beattributed to the defects such as oxygen vacancies in the film. The formation of oxygen vacancies upon ion irradiationresulting increase in band gap of pure ZnO, Znsub0.95/subVsub0.05/subO and Znsub0.90/subVsub0.10/subO thin films. The ion irradiated Znsub0.95/subVsub0.05/subO and Znsub0.90/subVsub0.10/subO films exhibit strong room temperature ferromagnetism as evidenced from VSM measurements. It isconclude that the spin associated with V ions together with increasing concentration of oxygen vacancies favoursenhanced ferromagnetic behaviour in irradiated V doped ZnO films.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.