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Multiferroic Consequence of Porous (BiFeO3) x –(BiCrO3)1−x Composite Thin Films by Novel Sol–Gel Method

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In this work, we have presented a spin-coating method to produce thin films started with pure BiCrO3 (BCO) and ended up with BiFeO3 (BFO) by increasing x values in the (BiFeO3) x –(BiCrO3)1−x composites. All the produced thin films have been crystallized at the annealing temperatures of 400 °C for 0.5 h. The XRD and EDAX spectrums give insight that the two crystal phases related to BCO and BFO stayed together within the thin film matrices. SEM analysis showed that the prepared composite had macroporous morphology with interconnected pores and its width (size) decreased with increasing x values. The strong correlations are observed among the microstructure, dielectric, ferroelectric, ferromagnetic properties and Fe concentration. Among all composites, the composition of 0.75 shows an attractive magnetization, polarization, switching and improved dielectric behaviors at room temperature. Significant increase in the multiferroic characteristics of 0.75 composition is due to arise of lower leakage current by causing reduction in oxygen vacancy density, and enhancement of super-exchange magnetic interaction between Fe3+ and Cr3+ at BFO/BCO interface layers. Our result shows that the thin layer on Pt (111)/Ti/SiO2/Si substrate possesses simultaneously improved ferroelectric and ferromagnetic properties which make an inaccessible potential application for nonvolatile ferroelectric memories.

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Acknowledgements

This work is supported by Department of Science and Technology (SB/S2/CMP- 028/2013), New Delhi, India. Authors are grateful to IIT-SAIF (Chennai) and UGC-DAE, Indore, for the experimental facilities and extended support. The authors also acknowledge the support rendered from the management and Dr. S. Arivazhagan, Principal of Mepco Schlenk Engineering College, Tamil Nadu, India.

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Authors and Affiliations

  1. Department of Physics, Mepco Schlenk Engineering College, Sivakasi, 626005, Tamil Nadu, India

    William Raja Victor, Marikani Arumugam & Thiruramanathan Pandirengan

  2. Department of Chemistry, Mepco Schlenk Engineering College, Sivakasi, 626005, Tamil Nadu, India

    Madhavan Durairaj

  3. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001, India

    Raghavendra Reddy Varimalla

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  1. William Raja Victor
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  2. Marikani Arumugam
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  3. Thiruramanathan Pandirengan
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Correspondence to Marikani Arumugam.

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Raja Victor, W., Arumugam, M., Pandirengan, T. et al. Multiferroic Consequence of Porous (BiFeO3) x –(BiCrO3)1−x Composite Thin Films by Novel Sol–Gel Method. Acta Metall. Sin. (Engl. Lett.) 31, 299–307 (2018). https://doi.org/10.1007/s40195-017-0593-4

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  • DOI: https://doi.org/10.1007/s40195-017-0593-4

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