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Effect of CoFe2O4 weight fraction on multiferroic and magnetoelectric properties of (1 − x)Ba0.85Ca0.15Zr0.1Ti0.9O3  −  xCoFe2O4 particulate composites

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Abstract

Different compositions of the composite lead-free multiferroic magnetoelectric systems are fabricated by employing piezoelectric Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) and magnetostrictive CoFe2O4 (CFO) by varying the CFO weight fraction. The magnetic, dielectric, ferroelectric and magnetoelectric (ME) properties of the system are analyzed and found to be varying with the ferrite concentration. Even though the composite systems exhibit high magnetocapacitance (MC) properties (~ 35%), the possible stray contributions from magnetoresistance and magnetostriction make it unreliable for the quantitative determination of ME coupling coefficient (MECC). Therefore, a dynamic method is chosen for the measurement of magnetoelectric coupling. All the compositions have shown fairly good ME coupling. It is found that the ME coupling increases with ferrite fraction and the highest ME coupling of 14.8 mV/(cm Oe) is observed for 0.6BCZT–0.4CFO composite. It is also observed that the ME voltage increases linearly with the ac modulating field with a voltage generation of 1.25 V/cm (for x = 0.4) for a small ac modulating field of 100 Oe. This high sensitivity and linear response of ME coupling to the ac magnetic fields offer the possibility of employing these particulate composites for a wide range of applications from magnetic field sensors to energy harvesters.

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Acknowledgements

ASK, CSC, VS, and SSN acknowledge Central University of Kerala for financial support. ASK wish to acknowledge University Grants Commission, India for the Junior and Senior Research Fellowship (F.17–131/2012(SA-1) and CSC and SSN wish to acknowledge DST, India for the financial support in WOS-A (SR/WOS-A/PS-14/2014) and YSS/2014/000431. SSN acknowledge DBT, India for the financial support through the project 6292P52/RGCB/PMD/DBT/RPKT/2015.

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Authors and Affiliations

  1. Dept. of Physics, Central University of Kerala, Kasaragod, 671316, India

    Ajith S. Kumar, C. S. Chitra Lekha, S. Vivek & Swapna S. Nair

  2. Dept. of Physics, Mahatma Gandhi University, Kottayam, 686560, India

    K. Nandakumar

  3. Dept. of Physics, Cochin University of Science and Technology, Kochi, 682022, India

    M. R. Anantharaman

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  1. Ajith S. Kumar
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Kumar, A.S., Lekha, C.S.C., Vivek, S. et al. Effect of CoFe2O4 weight fraction on multiferroic and magnetoelectric properties of (1 − x)Ba0.85Ca0.15Zr0.1Ti0.9O3  −  xCoFe2O4 particulate composites. J Mater Sci: Mater Electron 30, 8239–8248 (2019). https://doi.org/10.1007/s10854-019-01140-3

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