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Journal of Materials Science

, Volume 53, Issue 20, pp 14160–14171 | Cite as

Electric and magnetic properties of ferromagnetic/piezoelectric bilayered composite

  • Marin Cernea
  • Bogdan Stefan Vasile
  • Vasile Adrian Surdu
  • Roxana Trusca
  • Cristina Bartha
  • Floriana Craciun
  • Carmen Galassi
Ceramics
  • 228 Downloads

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.

Notes

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.

Compliance with ethical standards

Conflict of interest

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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Marin Cernea
    • 1
  • Bogdan Stefan Vasile
    • 2
  • Vasile Adrian Surdu
    • 2
  • Roxana Trusca
    • 2
  • Cristina Bartha
    • 1
  • Floriana Craciun
    • 3
  • Carmen Galassi
    • 4
  1. 1.National Institute of Materials PhysicsBucharest-MagureleRomania
  2. 2.University Politehnica of BucharestBucharestRomania
  3. 3.Istituto di Struttura della Materia-CNR (ISM-CNR)RomeItaly
  4. 4.CNR-ISTEC, Institute of Science and Technology for CeramicsFaenzaItaly

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