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We apply ultrafast x-ray diffraction with femtosecond temporal resolution to monitor the lattice dynamics in a thin film of multiferroic BiFeO3 after above-band-gap photoexcitation. The sound-velocity limited evolution of the observed lattice strains indicates a quasi-instantaneous photoinduced stress which decays on a nanosecond time scale. This stress exhibits an inhomogeneous spatial profile...

We report the significant improvement of the ferroelectric properties of BiFeO3thin film through control of electrical leakage by Nb doping. A very large remanent electrical polarization value of 80 μC/cm2 was observed in Bi0.8La0.2Nb0.01Fe0.99O3 thin film on Pt/Ti/SiO2/Si substrate. The doping effect of Nb in reducing the movable charge density due to oxygen vacancies in BiFeO3 was confirmed b...

The early diagnosis of colorectal cancer and the early detection of recurrence are central to effective treatment, as prognosis is directly related to the stage of the disease. When colorectal cancer is diagnosed at an early, localized stage, 5-year survival is 90%. With regional lymph node metastases, survival drops to 45-60%, and with distant metastases, 5-year survival is <5%. Development of...

Multiferroic materials simultaneously display ferroelectric and ferromagnetic properties in the same phase. [1] In the 1960s to 1970s, these materials were first investigated to understand the magnetoelectric (ME) coupling effect. Recently, there is increased interest in multiferroic materials because of their potential applications in novel devices using the magnetoelectric effects including s...

We demonstrate the microscopic role of oxygen vacancies spatially confined within nanometer inter-spacing (about 1 nm) in BiFeO3, using resonant soft X-ray scattering techniques and soft X-ray spectroscopy measurements. Such vacancy confinements and total number of vacancy are controlled by substitution of Ca(2+) for Bi(3+) cation. We found that by increasing the substitution, the in-plane orbi...

Related Articles Influence of target composition and deposition temperature on the domain structure of BiFeO3 thin films AIP Advances 2, 042104 (2012) Nanodomain structures formation during polarization reversal in uniform electric field in strontium barium niobate single crystals J. Appl. Phys. 112, 064117 (2012) The effect of the top electrode interface on the hysteretic behavior of epitaxial...

Bi-Fe oxides are stable materials with potential photocatalytic activity under solar light photons. So far, however the of pure-phase nanosized mullite-Bi2Fe4O9 has not been studied. Usually, synthesis is hampered by co-formation perovskite BiFeO3. Herein we demonstrate that nanoparticles prepared Flame Spray Pyrolysis (FSP) technology highly efficient O2 production photocatalysts, achieving &g...

The air void content is one of the most important volumetric properties asphalt matrixes, such as mixtures or mortars, because it can greatly affect performance matrix. At mixture level, there are standardized methods for measuring content, which an design parameter a mixture. However, at mortar scale, no unified method has been proposed to determine corresponding Therefore, this research aims ...

Increasing the content of anion vacancies may yield significant improvement in overall electrochemical energy-storing performance perovskite materials, where vacancy sites act as highly favorable ion diffusion paths. However, a detailed study on energy storage mechanism at binary cation under deficiency should be further explored supercapacitor electrode materials. In this study, simple hydroth...