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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/036/05/0813-0818

    • Keywords

       

      Ion irradiation; nanoparticles; atomic force microscopy; BiFeO3.

    • Abstract

       

      BiFeO3 (BFO) thin films of thickness about 800 nm deposited on Si (100) substrates by sol–gel spin coating method were irradiated by 200 MeV Ag ions. Modification of structure and surface morphology of the films under irradiation was studied using glancing incidence X-ray diffraction (GIXRD) and atomic force microscope (AFM). Fluence dependence of GIXRD peak intensity indicated formation of 10 nm diameter cylindrical amorphous columns in crystalline BFO due to 200 MeV Ag ion irradiation. AFM analysis indicated that the pristine film consists of agglomerated grains with diffuse grain boundary. Irradiation led to reduced agglomeration of the grains with the formation of sharper grain boundaries. The rms roughness (𝜎rms) estimated from AFM analysis increased from 6.2 in pristine film to 12.7 nm when the film irradiated at a fluence of 1 × 1011 ions cm-2. Further irradiation led to decrease of 𝜎rms which finally saturated at a value of 7–8 nm at high ion fluences. The power spectral density analysis indicated that the evolution of surface morphology of the pristine film is governed by the combined effect of evaporation condensation and volume diffusion processes. Swift heavy ion irradiation seems to increase the dominance of volume diffusion in controlling surface morphology of the film at high ion fluences.

    • Author Affiliations

       

      B N Dash1 2 P Mallick3 2 P Dash2 R Biswal2 Jai Prakash4 A Tripathi4 D Kanjilal4 N C Mishra2

      1. Department of Physics, Salipur College, Salipur 754 103, India
      2. Department of Physics, Utkal University, Bhubaneswar 751 004, India
      3. Department of Physics, North Orissa University, Baripada 757 003, India
      4. Inter-University Acceleration Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India
    • Dates

       

© 2017 Indian Academy of Sciences, Bengaluru.