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Magnetoelectric response and dielectric property of multiferroic Co0.65Zn0.35Fe2O4–PbZr0.52Ti0.48O3 nanocomposites

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Abstract

The effect of nanometric grain size modulation on the behavior of different kinds of chemically synthesized multiferroic ferrite–ferroelectric nanocomposites with cobalt zinc ferrite (Co0.65Zn0.35Fe2O4) as a ferrimagnetic component and lead zirconate titanate (PbZr0.52Ti0.48O3) as a ferroelectric component have been investigated in detail. Formation of two distinct pure phases of as-prepared nanocomposites was confirmed from recorded X-ray diffraction patterns at room temperature. The backscattered mode of a field emission scanning electron microscope micrograph has been used to study the microstructure, average grain size, and distribution of the two individual phases in the composites. Magnetization vs. magnetic field measurements clearly show the room temperature good hysteretic ferrimagnetic behavior of the composites having coercivity of 83–124 Oe and spontaneous magnetization of 20–24 emu/g. The dielectric constant is found to increase with increasing grain size of the nanocomposites from 124 to 687 at a frequency of 1 kHz. Investigation of temperature-dependent dielectric constant behavior reveals that the paraelectric–ferroelectric transition temperature decreases from 364 to 351 °C with decreasing particle size. A complex impedance spectroscopy study was carried out in the frequency range of 50 Hz–1 MHz and in the temperature range of 27–400 °C. The contribution of both grains and grain boundaries in the electrical properties of the composites has been confirmed from the complex impedance spectroscopy data. The activation energies estimated from the complex impedance spectroscopy and the ac conductivity spectrum are found to be nearly the same for the nanocomposites. The polarization vs. electric field measurement exhibits a typical ferroelectric hysteresis loop at room temperature and provides conclusive evidence of the presence of spontaneous polarization in the composites, confirming the presence of excellent ferroelectricity in the nanocomposites. At room temperature the multiferroic behavior of the composites is also confirmed from detailed magnetoelectric (ME) response studies. The optimal ME response is observed to be 0.6 % for higher temperature sintered composites.

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Acknowledgements

One of the authors (T.K.N.) would like to acknowledge the financial assistance of the Department of Science and Technology (DST), New Delhi, through project no. IR/S2/PU-04/2006.

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  1. Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India

    P. R. Mandal & T. K. Nath

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  1. P. R. Mandal
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  2. T. K. Nath
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Correspondence to T. K. Nath.

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Mandal, P.R., Nath, T.K. Magnetoelectric response and dielectric property of multiferroic Co0.65Zn0.35Fe2O4–PbZr0.52Ti0.48O3 nanocomposites. Appl. Phys. A 112, 789–799 (2013). https://doi.org/10.1007/s00339-013-7691-6

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  • DOI: https://doi.org/10.1007/s00339-013-7691-6

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