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- Title
Electric and magnetic properties of ferromagnetic/piezoelectric bilayered composite.
- Authors
Cernea, Marin; Vasile, Bogdan Stefan; Surdu, Vasile Adrian; Trusca, Roxana; Bartha, Cristina; Craciun, Floriana; Galassi, Carmen
- 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.
- Subjects
PIEZOELECTRIC materials; MAGNETIC properties; ELECTRIC properties; HETEROSTRUCTURES; SOL-gel processes
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 20, p14160
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2673-x