Ultrafast spectroscopy can provide unique tools to study and control electronic and structural dynamics on a femtosecond time scale. Here we study, the yet little explored multiferroic material, BaTiO3-BiFeO3 (BTO-BFO), that has demonstrated enhanced magnetic properties, a higher DC resistance in comparison to BFO, and improved magnetoelectric coupling. Our studies include ultrafast time resolv...

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Bismuth ferrite, BiFeO3, is an important multiferroic material that has attracted remarkable attention for potential applications in functional devices. While thin films of BiFeO3 are attractive for applications in nanoelectronics, bulk polycrystalline BiFeO3 has great potential as a lead-free and/or high-temperature actuator material. However, the actuation mechanisms in bulk BiFeO3 are still ...

Ferroelectric domain structures of epitaxial BiFeO3 thin films on miscut 001 SrTiO3 substrates have been studied by transmission electron microscopy. BiFeO3 on 0.8° miscut substrates are composed of both 109° and 71° domains; in contrast, only 71° stripe domains are observed in BiFeO3 on 4° miscut 001 SrTiO3 substrates. The domain width in BiFeO3 on 4° miscut substrates increases as film thickn...

BiFeO3 epitaxial films (tBFO = 1–10 nm) were grown on a LaSrMnO3 (tLSMO 70 buffer layer and capped with Ru or Ru/Al layer. The ultrathin film 3 was confirmed to be continuous flat over wide area. Piezoelectric response switching of spontaneous polarization observed in the by switching-spectroscopy piezoelectric force microscopy measurements. Using lock-in method modulation frequency 10 Hz x-ray...

A promising approach for obtaining a large magnetoelectric response at room temperature in single-phase materials is to make use of phase-change phenomena structural instabilities multiferroic state. This the case perovskites showing morphotropic phase boundary (MPB) between ferroelectric polymorphs with differentiated magnetic orderings, like BiFeO3–PbTiO3. Indeed, distinctive effects were rec...

We calculate the effect of epitaxial strain on the structure and properties of multiferroic bismuth ferrite, BiFeO3, using first-principles density-functional theory. We investigate epitaxial strain corresponding to an 001 -oriented substrate and find that, while small strain causes only quantitative changes in behavior from the bulk material, compressive strains of greater than 4% induce an is...

Transition metal oxides (TMOs) exhibit many emergent phenomena ranging from high-temperature superconductivity and giant magnetoresistance to magnetism and ferroelectricity. In addition, when TMOs are interfaced with each other, new functionalities can arise, which are absent in individual components. Here, we report results from first-principles calculations on the magnetism at the BiFeO3/YBa2...

Using high temperature solid state reaction technique ceramic composites (1-x)BiFeO3 - xBa5TbTi3V7O30 having different x values are prepared. Basic crystal qualities studied using XRD which shows that there’s a formation of BiFeO3 and Ba5TbTi3V7O30 phases. There observed change in the basic structure as changes is most distorted for = 0.5. From SEM study, it found grain size minimum pure ferroe...

The charge-spin interactions in multiferroic materials (e.g., BiFeO3) have attracted enormous attention due to their high potential for next generation information electronics. However, the weak and deficient manipulation of charge-spin coupling notoriously limits their commercial applications. To tailor the spontaneous charge and the spin orientation synergistically in BiFeO3 (BFO), in this re...