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BiFeO 3 thin films can be epitaxially stabilized in a nearly tetragonal phase under a high biaxial compressive strain. Here we investigate the polarized Raman spectra of constrained BiFeO 3 films with tetragonal-like ͑BFO-T͒, rhombohedral-like ͑BFO-R͒, and multiphase ͑BFO-T+ R͒ structure. Based on analysis of the number and symmetry of the Raman lines, we(More)
Sound propagation in the sonic crystal (SC) along the symmetry direction is modeled by sound propagation through a variable cross-sectional area waveguide. A one-dimensional (1D) model based on the Webster horn equation is used to obtain sound attenuation through the SC. This model is compared with two-dimensional (2D) finite element simulation and(More)
We combined first-principles calculations with optical spectroscopy and variable-temperature film growth techniques to comprehensively investigate the electronic structure of NiFe 2 O 4. We find this system to be an indirect-gap material in the minority channel, with two higher-energy direct-gap structures in the minority and majority channels,(More)
Polarized Raman spectra of NiFe 2 O 4 (NFO) films of varying thickness and growth temperature are investigated and discussed. We find that the relaxed films obtained at higher temperatures on MgAl 2 O 4 (MAO) substrate exhibit spectra identical to those of single crystals and provide strong indications for ordering of Ni 2+ and Fe 3+ at the octahedral(More)
Direct evidence of half-metallic density of states is observed by scanning tunneling spectroscopy of ferromagnetic La 0.7 Ca 0.3 MnO 3 and La 1Ϫx Sr x MnO 3 (xϭ0.3, 0.33) epitaxial films which exhibit colossal magnetoresistance ͑CMR͒. At 77 K, well below the Curie temperatures, the normalized tunneling conductance (dI/dV)/͗I/V͘ for all samples exhibits(More)
In the present paper, the characteristic atmospheric pool boiling curve is qualitatively reproduced for water on a temperature controlled thin copper strip having comparable length and breadth by the coupled map lattice (CML) method using a three-dimensional boiling field model. The basic objective of the work is to improve the prediction of the critical(More)
Articles you may be interested in Magnetic and magnetotransport properties of half-metallic CrO2-SnO2 composites We have investigated (110) CrO 2 /natural barrier/Co magnetic tunnel junctions for their barrier and magneto-transport properties. A negative tunnel magnetoresistance (TMR) of over 5% was observed in micro-fabricated devices at 4.2 K, which is(More)
Articles you may be interested in Strain effect caused by substrates on phase separation and transport properties in Pr0.7(Ca0.8Sr0.2)0.3MnO3 thin films Impact of yttrium on structure and mechanical properties of Cr–Al–N thin films Strain effects in thin films of CrO 2 on rutile and sapphire substrates We report a study of substrate-induced strain and its(More)
Articles you may be interested in Probing optical band gaps at the nanoscale in NiFe2O4 and CoFe2O4 epitaxial films by high resolution electron energy loss spectroscopy Optical and magneto-optical study of nickel and cobalt ferrite epitaxial thin films and submicron structures High ferromagnetic resonance and thermal stability spinel Ni0.7Mn0.3−xCoxFe2O4(More)