Charris-Hernández, Amanda E.

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    Synthesis and multiferroic properties of Bi3.4M0.6Ti3O12/CoFe2O4 (M= La3+ and Sm3+) multilayer structures
    (2013) Charris-Hernández, Amanda E.; Tomar, Maharaj S.; College of Arts and Science - Science; Castellanos, Dorial; Lysenko, Sergiy; Department of Physics; Ducoudray, Gladys O.
    In search of new multiferroic materials Bi4-xMxTi3O12 and CoFe2O4 alternate layers were investigated. For this work, multilayer films of Bi3.4M0.6Ti3O12 with M = La3+, Sm3+ and CoFe2O4 were synthesized by chemical solution method and deposited by spin coating processing on Pt (Pt/Ti/SiO2/Si) substrate and annealed at 750 °C under oxygen atmosphere, because both materials reach at 750 oC their formation phase. Multilayers were investigated by X-ray diffraction and Scanning electron microscopy (SEM). X-ray patterns for pure CoFe2O4, Bi3.4M0.6Ti3O12 and Bi3.4Sm0.6Ti3O12 confirm the formation of the spinel and perovskite structures respectively. On the other hand the presence of the predominant peaks (006), (117) of Bi4Ti3O12 and (311), (511) of CoFe2O4 in all the multilayers revealed the composite-like structure. Multilayer show large values in spontaneous ferroelectric polarization and ferromagnetic memory with well-saturated hysteresis loop, confirming composite behavior of the material. The better polarization values were observed in films that exhibit a preferential orientation in the c-axis as well as in those films with layers of Bi4- xMxTi3O12 thicker. The leakages current were below 10-5 A for most samples, and the dielectric response showed clear relaxation in the frequency range 10-2 – 10-6 Hz. The relaxation seems to reflect on the ferroelectric and ferromagnetic responses. The co-existence of ferroelectric and ferromagnetic in alternate Bi3.4M0.6Ti3O12/CoFe2O4 (M= La and Sm) layers is attributed to the stress in the composite material, due to different permittivity and permeability of the materials involved.