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Enhanced magnetic and structural properties of Ca doped BiFeO3 thin films

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Abstract

We report on preparation of Bi1−xCaxFeO3 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) thin films using a cost-effective and lower temperature sol–gel process. Structural, optical and magnetic properties are studied for the films annealed in vacuum in presence of magnetic field (500 Oe) at 300 °C for 60 min. X-ray diffraction results show rhombohedrally distorted perovskite structure of BiFeO3 in un-doped and doped films. Structure is seen to be affected by the charge compensation mechanism (oxygen vacancies) caused by replacement of trivalent ion (Bi3+) with divalent anion (Ca2+). Smaller crystallite size (~25.8 nm) with minimum stacking fault probability is observed for x = 0.2. Addition of Ca2+ forms localized states within the forbidden band thus leads to a decrease in direct band gap from 2.7 to 2.4 eV. Ferromagnetic behaviour is observed for all the calcium (Ca) doping concentrations in BiFeO3 thin films. High saturation magnetization (M s ) of ~130 emu/cm3 is observed for the dopant concentration of 0.2.

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Authors and Affiliations

  1. Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan

    S. Riaz, F. Majid, S. M. H. Shah & S. Naseem

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  1. S. Riaz
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  2. F. Majid
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  3. S. M. H. Shah
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  4. S. Naseem
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Correspondence to S. Riaz.

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Riaz, S., Majid, F., Shah, S.M.H. et al. Enhanced magnetic and structural properties of Ca doped BiFeO3 thin films. Indian J Phys 88, 1037–1044 (2014). https://doi.org/10.1007/s12648-014-0546-y

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  • DOI: https://doi.org/10.1007/s12648-014-0546-y

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