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Enhanced magnetic and dielectric properties of Eu and Co co-doped BiFeO3 nanoparticles

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7 Author(s)
Chakrabarti, Kaushik ; Department of Materials Science, Indian Association For the Cultivation of Science, Jadavpur, Kolkata-700032, India ; Das, Kajari ; Sarkar, Babusona ; Ghosh, Sirshendu
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Bi1-xEuxFe1-yCoyO3 (x = 0, 0.01; y = 0, 0.01) nanoparticles, having an average size of 13 nm, were prepared by a simple sol gel route. Strong electronegativity of Eu3+ and smaller oxidation-reduction potential of Co3+/Co2+ (0.55 eV) than Fe3+/Fe2+ (1.3 eV) increase the concentration of Fe3+ ions with doping. Distinct magnetic hysteresis and complete saturation of magnetisation indicate the presence of ferromagnetic phase. The successful co-doping of Eu and Co into BiFeO3 (BFO) lattice dramatically enhances the saturation magnetization (Ms) and coercivity (Hc) by about 20 times than that of pure BiFeO3. A large value of dielectric constant of about 650, low loss (<0.001), and small leakage current density (1.79 × 10-8 A/cm2) are observed for the co-doped sample.

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Applied Physics Letters  (Volume:101 ,  Issue: 4 )