Grain size distribution dependent magnetic and ferroelectric properties in sol–gel driven BiFeO3 thin films

  • Shiwani Sharma
  • P. Saravanan
  • O. P. Pandey
  • Puneet Sharma
Article

Abstract

The effect of thickness induced grain size distribution on the magnetic and ferroelectric behaviour of sol–gel driven BiFeO3 (BFO) thin films was investigated in this study. FESEM micrographs showed well-crystallized equiaxed grains with minimal porosity. The magnetization (M) versus magnetic field (H) indicated the well saturated hysteresis loops at 300 K. The saturation magnetization (M s) is found to decrease from 18.9 to 0.93 emu/cm3 on increasing the film thickness from 156 to 388 nm. The high M s value obtained in the BFO films due to the uncompensated spins originated at grain boundary tends to decrease with the film thickness. At low temperature (10 K), non-saturated MH loops are observed due to spin freezing effect. The dielectric and ferroelectric properties improve with better growth and densification of grains in the BFO thin films with increasing thickness.

Notes

Acknowledgments

The author Shiwani Sharma gratefully acknowledge the University Grants Commission (UGC) for the fellowship (letter no. - SPMS/UGC/607). Author Puneet Sharma acknowledges funding granted by UGC 40-446/2011 (SR).

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Shiwani Sharma
    • 1
  • P. Saravanan
    • 2
  • O. P. Pandey
    • 1
  • Puneet Sharma
    • 1
  1. 1.School of Physics and Materials ScienceThapar UniversityPatialaIndia
  2. 2.Defence Metallurgical Research LaboratoryHyderabadIndia

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