Magnetoelectric, magnetodielectric effect and dielectric, magnetic properties of microwave-sintered lead-free x(Co0.9Ni0.1Fe2O4)-(1-x)[0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3)] particulate multiferroic composite

Electrical, magnetic and microwave absorption properties of multiferroic NiFe2O4-BaTiO3 nanocomposites

“…We see that the hysteresis P(E) curve has a narrow nature and curvature when examined in the electric field generated by the applied external voltages of 100-900 V. Nevertheless, the observed P(E) loops do not show the saturation status yet, which could be related to the leakage currents in the sample. This behavior is also agreed with previous studies on BTO family [26,47,[50][51][52]58]. With an increase in NFO content, the hysteresis curves tend to expand gradually in the shape of a fingerprint.…”

“…The positive and negative counterpart values of E C and P r are not asymmetry, corresponding to the presence of an internal electric field, which is caused by the short distance, off-center and as well as the inherent movement of bound electrons [72]. Regarding the studies of multiferroic BTO-based composites with other FM phases fabricated by using mechano-chemical activation technique [71], high energy ball milling [50] and solid-state reaction methods [39,51,52,73] have shown similar results. To improve the electrical and magnetic properties of multiferroics, besides changing the fraction of the FM and FE phases, the fabricated methods also greatly affect their characters, as shown in table 1.…”

“…Additionally, the hysteresis curves tend to expand, the E C value gradually increases from 0.4 to 2.0 kV cm −1 , the P r value increases gradually from 0.004 to 0.038 μC cm −2 for C0-C4. These increases are attributed to the pinning effect arising that relate to the presence of FM phase in composites [50][51][52]. The high internal polarization led to the enhancement of P r and P m [70].…”

“…Additionally, BTO is also a lead-free ferroelectric material with wide bandgap and quite high Curie temperature [40][41][42][43][44][45]. Therefore, BTO was chosen as a typical FE material to create multiferroic composites, such as BaTiO 3 -NiFe 2 O 4 [26], BaTiO 3 -CoFe 2 O 4 [41], BaTiO 3 -Ni 0.7 Zn 0.3 Fe 2 O 4 [46], Ba 0.9 Sr 0.1 Ti 0.9 Zr 0.1 O 3 -CoFe 2 O 4 [47], Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 -CoFe 2 O 4 [48], BaTiO 3 -CoFe 2 O 4 [49], BaTiO 3 -BiFeO 3 [50], BaTiO 3 -Bi 0.85 La 0.15 FeO 3 [51], [0.5(Ba 0.7 Ca 0.3 TiO 3 )−0.5(BaZr 0.2 Ti 0.8 O 3 )]-Co 0.9 NiFe 2 O 4 [52]. Among spinel ferrites, nickel ferrite (NiFe 2 O 4 : NFO) is a typical ferromagnetic exhibiting the high initial permeability, which is an important character to improve the electromagnetic conversion factor in multiferroic composites [26,27,29].…”

Magnetodielectric Effect in Microwave-Sintered Ba0.8Sr0.2TiO3 and Co0.9Ni0.1Fe2O4 Composite

“…A combination of two materials in a single material can result in new properties such as magnetodielectric and magneto-optic properties [4]. Of these, the composite materials possessing magnetodielectric properties are important owing to their useful applications in the miniaturization of devices for advanced technologies [5,6]. In ME composites, the electric polarization can be adjusted by the application of a magnetic field, whereas in magnetodielectric composites, the dielectric properties are modified upon the application of a magnetic field.…”