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Start Over Author "Bala, Kanchan" Topic thin films
5 results on '"Bala, Kanchan"'

2. Electrical Conduction Mechanism and Improved Multiferroic Properties of NFO/ (Pb0.50Sr0.50) TiO3 Bilayer Nanostructure Composite Thin Film.

Author

Bala, Kanchan, Ram, Mast, Sharma, Hakikat, and Negi, N. S.

Subjects
*ELECTRIC conductivity, *MULTIFERROIC materials, *NANOCOMPOSITE materials, *THIN films, *SURFACE morphology
Abstract

Multiferroic 2-2 type layered NFO/ (Pb0.50Sr0.50) TiO3 composite thin film on Pt/TiO2/Si substrate was prepared by novel metallo-Organic process using spin coating technique. The structural and surface morphology were confirmed by X-Ray diffraction (XRD) atomic force microscope (AFM). Significantly improved ferroelectric properties (Ps ∼ 8.69, Pr ∼ 3.19 μC/cm2 and Ec ∼ 419kV/cm) and magnetic properties (Ms), (Mr) and (Hc) is (104emu/cc, 0.8emu/cc and 25Oe.) were observed at room temperature. Our observation provides an effective way to manipulate the conduction behavior to understand the leakage current density of multiferroic composites film at the interface. Poole-Frankel tunneling conduction mechanism dominates the leakage current of films in the relatively high electric filed. [ABSTRACT FROM AUTHOR]

Published
2016
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3. Investigation on multiferroic, optical and photoluminescence properties of CoFe2O4/(Pb1−xSrx)TiO3 nanostructured composite thin films.

Author

Bala, Kanchan, Sharma, Pankaj, and Negi, N.S.

Subjects
*MULTIFERROIC materials, *TITANIUM dioxide nanoparticles, *COBALT compounds, *METALLIC thin films, *IRON oxides, *PHOTOLUMINESCENCE
Abstract

Multiferroic nanostructured composite thin films consisting of CoFe 2 O 4 (CFO) and Pb 1−x Sr x TiO3 (PST; x = 0.1, 0.2, 0.3, 0.4 and 0.5) layers have been deposited on Pt/TiO 2 /SiO 2 /Si and quartz substrates by using metallo-organic decomposition process and spin coating. The effect of Sr content on the multiferroic and optical properties have been investigated. The phase purity such as spinel structure of CFO and perovskite structure of PST has been verified by X-ray diffraction. Cross-sectional scanning electron microscopy images revealed clear interface between CFO and PST layers without any noticeable diffusion. The multiferroic properties of CFO/PST composite films have been confirmed by magnetic and ferroelectric hysteresis loops with low leakage current density. The residual strain sensitivity of multiferroic and optical properties has been observed in the composite films. The decrease in saturation magnetization and saturation polarization with increase in Sr content has been observed which could be attributed to the decrease in residual strain of CFO/PST composite films. The magnetic phase transition temperature of the CFO/PST composite films is also reduced. The optical refractive index decreases with increase of amount of Sr content. The photoluminescence spectra of the CFO/PST composite films possess a blue shift which can be attributed to the Pb and oxygen vacancies as localized sensitizing centers. We show that the multiferroic and optical properties of the CFO/PST composite films are highly sensitive to the heterostructure strains which can be controlled by Sr content. [ABSTRACT FROM AUTHOR]

Published
2016
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4. Electronic conduction mechanism for NFO/ (Pb0.80Sr0.20) TiO3 bi-layered nanostructure multiferroic composite thin film.

Author

Bala, Kanchan, Sharma, Hakikat, and Negi, N. S.

Subjects
*TITANIUM dioxide, *ELECTRIC conductivity, *NANOSTRUCTURED materials, *MULTIFERROIC materials, *THIN films, *X-ray diffraction
Abstract

Multiferroic 2-2 type bi-layered NFO/ (Pb0.80Sr0.20) TiO3 composite thin film on Pt/TiO2/Si substrate was prepared by novel metallo-Organic process using spin coating technique. The structural and surface morphology were confirmed by X-Ray diffraction (XRD) atomic force microscope (AFM). Significantly improved ferroelectric properties (Ps ~ 17.25, Pr ~8.02 µC/cm² and Ec ~ 404kV/cm) and magnetic properties (Ms ~ 117emu/cc, Mr ~ 0.83emu/cc and Hc ~ 20Oe) were observed at room temperature. The leakage current densities in NFO/PST composites film have been studied. Poole-Frankel bulk limited conduction mechanism dominates of film at relatively high electric filed. [ABSTRACT FROM AUTHOR]

Published
2016
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5. Structural, magnetic and optical properties of Ni0.5Zn0.5Fe2O4 nanostructured thin films.

Author

Bala, Kanchan and Negi, N. S.

Subjects
*IRON oxides, *MAGNETIC properties of thin films, *NANOSTRUCTURED materials, *OPTICAL properties, *THIN films, *ORGANOMETALLIC compounds, *REFRACTIVE index, *MAGNETIZATION, *CRYSTALLOGRAPHY
Abstract

Ni0.5Zn0.5Fe2O4(Ni-Zn) nanostructured thin films have been deposited on Si substrates by chemical solution method using metallo-organic precursors. These films were annealed at different temperature range 450°C-700°C for 2h. The crystalline orientation of the films was changed from (311) to (400) on increasing annealing temperature to 550°C. The crystallite size also increases from 5nm to 10nm. The saturation magnetization Ms∼302 emu/cm3, was measured for Ni-Zn thin films annealed at 700°C. The optical properties of Ni0.5Zn0.5Fe2O4 thin film such as refractive index (n), extinction coefficient (k), energy band gap, optical dielectric constant and conductivity have been extracted from the transmission spectrum measured in the wavelength range 400-1100nm. The refractive index and extinction coefficients of the Ni-Zn film have been obtained by the Swanepoel method. [ABSTRACT FROM AUTHOR]

Published
2013
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