Superlattices composed of ferromagnetic Pr0.85Ca0.15MnO3 and ferroelectric Ba0.6Sr0.4TiO3 layers were fabricated on (100) SrTiO3 substrates by a pulsed-laser deposition method. The capacitance and resistive parts of the samples were analyzed from the complex impedance measurements, performed on the samples using a special experimental set-up. The superlattice with larger ferroelectric thickness shows unique characteristics which are not present in the parent ferromagnetic thin film. The superlattice show both ferromagnetic and ferroelectric transitions which is an evidence for the coexistence of both the properties. The high magnetoresistance (40 % at 80K) shown by the superlattice can be attributed to the coupling between ferromagnetic and ferroelectric layers, i.e, to the magnetoelectric effect.

Tailoring of ferromagnetic Pr0.85Ca0.15MnO3/ferroelectric Ba0.6Sr0.4TiO3 superlattices for multiferroic properties

Magnetoelectric composites are promising materials for their physical properties such as spontaneous electrical polarization or magnetization with the application of magnetic or electric field. In addition, Spinel ferrite based magnetoelectric composite materials absorb a range of light energy, which offers a lot of physical phenomena behind the light-dependent magnetoelectric properties of the composite. The piezoelectric organic polymer based magnetoelectric composite of Zn0.2Co0.8Fe2O4-poly(vinylidene fluoride) flexible film has been fabricated by a chemical pyrophoric reaction process followed by a solution casting process. Structural and surface morphologies of the composite film have been studied. The visible light and applied magnetic field dependent AC electrical properties of the composite flexible film have been investigated at room temperature which reveals that the maximum change in impedance is found to be ∼10% and ∼20%, respectively. However, with an influence of both the light and the magnetic field, the impedance of the composite film is largely changed attributing that the excited electron may get a low resistive path through the grain and grain boundaries where the maximum change in impedance is found to be ∼30%. This result further is confirmed from the change of grain and grain boundary resistance and capacitance through the fitting of Nyquist plots. The present work provides information about the optically and magnetically influenced physical properties of the composite flexible film, which will be expanded for multiferroic magnetoelectric device applications.

Optically tunable magnetoelectric properties of inorganic-organic multiferroic flexible film

Annealing heating rate dependence of microstructure and multiferroic properties in Bi4Ti2.9Fe0.1O12/CoFe2O4 layered magnetoelectric composite films prepared by chemical solution deposition method

The magnetoelectric films of Ba0.9Ca0.1TiO3(BCT)/CoFe2O4(CFO) were deposited on Pt(111)/Ti/SiO2/Si(100) substrates by the sol-gel and spin-coating method under three kinds of heat-treatment conditions. It is shown that the heat-treatment conditions have a great effect on the ferroelectric, ferromagnetic and magnetoelectric properties of the composite films. Among the composite films prepared under three kinds of heat-treatment conditions, the composite films prepared under the complete heat-treatment condition (CHC composite films) have the best ferroelectric, ferromagnetic and magnetoelectric properties. They possess largest value of αE (82 mV cm−1 Oe−1). The complete heat-treatment condition is the most appropriate heat-treatment condition for obtaining the best magnetoelectric properties. Ferroelectric phase and ferromagnetic phase can coexist without inter-diffusion at the interface in CHC composite films.

Impact of heat-treatment conditions on ferroelectric, ferromagnetic and magnetoelectric properties of multi-layered composite films of Ba 0.9 Ca 0.1 TiO 3 /CoFe 2 O 4

Thickness-dependent ferromagnetic, ferroelectric, and energy storage performances of (Bi0.5Na0.5)0.94Ba0.06TiO3/La0.67Sr0.33MnO3 composite films by pulsed laser deposition

The enhanced magnetoelectric effect and piezoelectric properties in the lead-free Bi3.15Nd0.85Ti3O12/La0.7Ca0.3MnO3 nano-multilayers composite thin films

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The enhanced magnetoelectric effect and piezoelectric properties in the lead-free Bi3.15Nd0.85Ti3O12/La0.7Ca0.3MnO3 nano-multilayers composite thin films