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Electric and magnetic properties of ferromagnetic/piezoelectric bilayered composite

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Abstract

One of the most promising ways for the realization of multi-functional materials is the integration of oxides with different properties in artificial heterostructures. In this paper, a novel piezoelectric–ferromagnetic heterostructure consisting of 0.92Na0.5Bi0.5TiO3–0.08BaTiO3 (abbreviated as BNT–BT0.08) and CoFe2O4 layers is fabricated on Si–Pt substrate, by sol–gel method coupled with spin-coating technique. The composite thin film shows only perovskite Bi0.5Na0.5TiO3-like rhombohedral phase and CoFe2O4 cubic phase. The thickness of CoFe2O4 and BNT–BT0.08 layers is ~ 280 and ~ 400 nm, respectively. BNT–BT0.08/CoFe2O4 heterostructure thin film shows a saturation magnetization of 0.11 emu/g at 5 K and 0.07 emu/g at 295 K, dielectric constant of 235 at 1 kHz and tunability of 70% at 1 kHz and an electric field E = 110 kV/cm. The results reveal that the investigated hybrid piezoelectric/ferromagnetic structure shows piezoelectric behavior, good ferroelectric and ferromagnetic properties. This bilayer composite can be used in miniature low-frequency magnetic sensor and piezoelectric sensor for biomedical domain.

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Acknowledgements

The authors thank Matthias A. Fenner and Denis Fokin for assistance in piezoelectric characterization of the heterostructure thin film. The SEM analyses on samples were possible due to EU-funding grant POSCCE-A2-O2.2.1-2013-1/Priority direction 2, Project No. 638/12.03.2014, cod SMIS-CSNR 48652.

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Authors and Affiliations

  1. National Institute of Materials Physics, P.O. Box MG-7, 077125, Bucharest-Magurele, Romania

    Marin Cernea & Cristina Bartha

  2. University Politehnica of Bucharest, 060042, Bucharest, Romania

    Bogdan Stefan Vasile, Vasile Adrian Surdu & Roxana Trusca

  3. Istituto di Struttura della Materia-CNR (ISM-CNR), Area di Ricerca di Tor Vergata, 00133, Rome, Italy

    Floriana Craciun

  4. CNR-ISTEC, Institute of Science and Technology for Ceramics, Via Granarolo 64, 48018, Faenza, Italy

    Carmen Galassi

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  1. Marin Cernea
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Correspondence to Marin Cernea.

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The authors and the institutes where the work has been carried out declare that there are no conflicts of interest regarding the publication of this article.

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Cernea, M., Vasile, B.S., Surdu, V.A. et al. Electric and magnetic properties of ferromagnetic/piezoelectric bilayered composite. J Mater Sci 53, 14160–14171 (2018). https://doi.org/10.1007/s10853-018-2673-x

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