1 research outputs found
Nanoparticle-Based Magnetoelectric BaTiO<sub>3</sub>–CoFe<sub>2</sub>O<sub>4</sub> Thin Film Heterostructures for Voltage Control of Magnetism
Multiferroic
composite materials combining ferroelectric and ferromagnetic
order at room temperature have great potential for emerging applications
such as four-state memories, magnetoelectric sensors, and microwave
devices. In this paper, we report an effective and facile liquid phase
deposition route to create multiferroic composite thin films involving
the spin-coating of nanoparticle dispersions of BaTiO<sub>3</sub>,
a well-known ferroelectric, and CoFe<sub>2</sub>O<sub>4</sub>, a highly
magnetostrictive material. This approach offers great flexibility
in terms of accessible film configurations (co-dispersed as well as
layered films), thicknesses (from 100 nm to several μm) and
composition (5–50 wt % CoFe<sub>2</sub>O<sub>4</sub> with respect
to BaTiO<sub>3</sub>) to address various potential applications. A
detailed structural characterization proves that BaTiO<sub>3</sub> and CoFe<sub>2</sub>O<sub>4</sub> remain phase-separated with clear
interfaces on the nanoscale after heat treatment, while electrical
and magnetic studies indicate the simultaneous presence of both ferroelectric
and ferromagnetic order. Furthermore, coupling between these orders
within the films is demonstrated with voltage control of the magnetism
at ambient temperatures