Probing the dielectric, piezoelectric and magnetic behavior of CoFe2O4/BNT-BT0.08 composite thin film fabricated by sol-gel and spin-coating methods

Marin Cernea; Bogdan Stefan Vasile; Vasile Adrian Surdu; Roxana Trusca; Cristina Bartha; Floriana Craciun; Carmen Galassi

doi:10.1038/s41598-018-36232-3

Probing the dielectric, piezoelectric and magnetic behavior of CoFe₂O₄/BNT-BT_0.08 composite thin film fabricated by sol-gel and spin-coating methods

Sci Rep. 2018 Dec 14;8(1):17883. doi: 10.1038/s41598-018-36232-3.

Authors

Marin Cernea¹, Bogdan Stefan Vasile², Vasile Adrian Surdu³, Roxana Trusca³, Cristina Bartha¹, Floriana Craciun⁴, Carmen Galassi⁵

Affiliations

¹ National Institute of Materials Physics, P.O. Box MG-7, Bucharest-Magurele, 077125, Romania.
² University POLITEHNICA of Bucharest, 060042, Bucharest, Romania. bogdan.vasile@upb.ro.
³ University POLITEHNICA of Bucharest, 060042, Bucharest, Romania.
⁴ Istituto di Struttura della Materia-CNR (ISM-CNR), Area di Ricerca di Tor Vergata, I-, 00133, Roma, Italy.
⁵ CNR-ISTEC, Institute of Science and Technology for Ceramics, Via Granarolo 64, I-, 48018, Faenza, Italy.

Abstract

We investigated in this paper a novel bilayer composite obtained by sol-gel and spin coating of the ferroelectric 0.92Na_0.5Bi_0.5TiO₃-0.08BaTiO₃ (abbreviated as BNT-BT_0.08) and ferromagnetic CoFe₂O₄ phases, for miniature low-frequency magnetic sensors and piezoelectric sensors. This heterostructure, deposited on Si-Pt substrate (Si-Pt/CoFe₂O₄/BNT-BT_0.08), was characterized using selected method such as: X-ray diffraction, dielectric spectroscopy, piezoelectric force microscopy, SQUID magnetometry, atomic force microscopy/magnetic force microscopy, and advanced methods of transmission electron microscopy. CoFe₂O₄/BNT-BT_0.08 ferromagnetic-piezoelectric thin films show good magnetization, dielectric constant and piezoelectric response. The results of analyses and measurements reveal that this heterostructure can have applications in high-performance magnetoelectric devices at room temperature.