Defects induced magnetization in B-doped ZnFeO dilute magnetic semiconductors

2015 
Abstract Zn 0.95− x Fe 0.05 B x O ( x =0, 0.05) nano-particles have been synthesized using a modified chemically derived citrate gel method. X-ray diffraction analysis demonstrates the wurtzite type hexagonal structure belonging to P6 3 mc space group without the presence of any secondary phase in both compositions. The Diffraction analysis shows that Fe 2+ and B 3+ ions have replaced some of the Zn 2+ ions while some occupy un-detectable interstitial and inter-granular positions inside the structure. Scanning electron micrographs obtained using scanning electron microscopy show typical smaller size of particles in B-doped composition. Temperature dependent electrical resistivity analysis shows the semiconducting characteristics of the compositions and that doping of Fe and B up to 10 at% does not change the electrical behavior of the host material. Magnetic measurements display room temperature ferromagnetism in both compositions with enhanced magnetization in B-doped composition associated with defect induced magnetic mechanism belonging to intrinsically augmented interstitial and inter-granular effects.
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