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Article
Temperature dependence of magnetic and magnetotransport properties in BiFeO3 thin films by pulsed laser deposition
Multiferroic BFO/SRO/Si trilayers have been prepared by pulsed laser deposition in the form of thin films. As a function of the BFO layer thickness, magnetic and magneto-transport properties have been investig...
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Article
Piezoresponse Force Microscopy Studies on (100), (110) and (111) Epitaxially Growth BiFeO3 Thin Films
Bismuth ferrite (BiFeO3) is a magnetoelectric, multiferroic material with coexisting ferroelectric and magnetic orderings. It is considered as a candidate for the next generation of ferroelectric random-access me...
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Article
TEM Study of the Morphology Of GaN/SiC (0001) Grown at Various Temperatures by MBE
GaN films grown on SiC (0001) by MBE at various substrate temperatures (600° - 750° C) were characterized by RHEED, STM, x-ray diffraction, AFM and TEM. This work focuses on the TEM analysis of the films’ feat...
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Article
TEM Study of Bulk AlN Growth by Physical Vapor Transport
We are attempting to grow bulk AlN that would be suitable as a substrate for nitride film growth. Bulk AlN films were grown by physical vapor transport on 3.5° offaxis and on-axis 6H SiC seed crystals and char...
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Article
Structural Characterization of GaN Nanowires Fabricated via Direct Reaction of Ga Vapor and Ammonia
We report structural studies of large-scale wurtzite GaN nanowires fabricated by direct reaction of Ga vapor and NH3. This recently reported growth technique [1] demonstrates processing of GaN one-dimensional str...
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Article
Atomic Force Microscopy and Transmission Electron Microscopy Study of Self-Organized Ordering in Vertically Aligned PbSe Quantum Dot Superlattices
Self-organized lateral ordering is studied for PbSe/Pb1-xEuxTe quantum dot superlattices as a function of spacer thickness using atomic force microscopy and transmission electron microscopy. It is found that a pr...
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Article
Magnetic Heat Capacity of Stage 2 Graphite-CoCl2
The heat capacity Cp of graphite-CoCl2 (stage 2) is measured at zero and high (up to 14 T) magnetic fields (H applied in-plane). By suppressing the magnetic contribution to Cp at the highest fields, we are able t...
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Article
Commensurate-Glass Phase Transitions in Staged SbCl5-GIC
An experimental study is reported of the commensurate (√7 × √7)R19.1° to glass phase transition in stages I ≼ n ≼ 4 graphite-SbCl5 using electron and x-ray diffraction. The electron diffraction studies show an in...
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Article
Effect of Ge on SiC Film Morphology in SiC/Si Films Grown by MOCVD
SiC/Si films generally contain stacking faults and amorphous regions near the interface. High quality SiC/Si films are especially difficult to obtain since the temperatures usually required to grow high qualit...
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Article
Effects of a-Si:H resist vacuum-lithography processing on HgCdTe
A vacuum-compatible process for carrying out lithography on Hg1−xCdxTe and CdTe films was previously demonstrated. It was shown that hydrogenated amorphous silicon (a-Si:H) could be used as a dry resist by projec...
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Article
On the origin of high-temperature ferromagnetism in the low-temperature-processed Mn–Zn–O system
The recent discovery of ferromagnetism above room temperature in low-temperature-processed MnO2–ZnO has generated significant interest. Using suitably designed bulk and thin-film studies, we demonstrate that the ...
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Article
Self-assembled single-crystal ferromagnetic iron nanowires formed by decomposition
Arrays of perpendicular ferromagnetic nanowires have recently attracted considerable interest for their potential use in many areas of advanced nanotechnology. We report a simple approach to create self-assemb...
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Article
Processing and characterization of a-Si:H photoresists for a vacuum-compatible photolithography process
The vision of achieving a completely in-vacuum process for fabricating HgCdTe detector arrays is contingent on the availability of a vacuumcompatible photolithography technology. One such technology for vacuum...
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Article
Ordering in (La,Sr)(Al,Ta)O3 substrates
(La, Sr)(Al, Ta)O3 (LSAT) has recently received increased attention as a substrate for the deposition of various oxide films. LSAT is usually considered as having a perovskite structure. However, the exact atomic...
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Article
Role of Pb excess in the crystallization of lead zirconate titanate films derived via sol-gel processing
Sol-gel spin coating of lead-titanate films differs from most processing routes, such as metalorganic chemical vapor deposition and pulsed laser deposition, in that crystallization cannot occur without a postd...
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Article
Properties of GaN epitaxial layers grown on 6H-SiC(0001) by plasma-assisted molecular beam epitaxy
The structural, electrical, and optical properties of GaN grown on 6H-SiC(0001) substrates by molecular beam epitaxy are studied. Suitable substrate preparation and growth conditions are found to greatly impro...
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Article
TEM Study of the Morphology Of GaN/SiC (0001) Grown at Various Temperatures by MBE
GaN films grown on SiC (0001) by MBE at various substrate temperatures (600° - 750° C) were characterized by RHEED, STM, x-ray diffraction, AFM and TEM. This work focuses on the TEM analysis of the films’ feat...
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Article
TEM Study of Bulk AlN Growth by Physical Vapor Transport
We are attempting to grow bulk AlN that would be suitable as a substrate for nitride film growth. Bulk AlN films were grown by physical vapor transport on 3.5° off-axis and on-axis 6H SiC seed crystals and cha...
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Article
Optimization of Bismuth Nanowire Arrays by Electrochemical Deposition
Bismuth nanowires for thermoelectric applications have been made by electrochemical deposition from an aqueous Bi solution into nanoporous mica substrates, and Anopore (Al2O3) filters. The nanoporous substrates a...
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Article
Formation of the (La0.67Sr0.33)2MnO4 Phase in La–Sr–Mn–O Thin Films by Pulsed Laser Deposition
La0.67Sr0.33MnO3 thin films were grown on LaAlO3 substrate in vacuum using pulsed laser deposition to investigate the effect of changing oxygen content. Transmission electron microscopy studies showed that the ep...
