Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"epitaxial films"”.
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Metrology of very thin silicon epitaxial films
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Metrology of very thin silicon epitaxial films
… thickness measurement of sub-0.5 µm silicon epitaxial films has been successfully performed using spectroscopic ellipsometry (SE) in the visible to near infrared (NIR) range (0.73 - 3.3 eV). The undoped epitaxial .films are grown on heavily doped substrates by chemical vapor deposition at 700 …
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Magnetic anisotrophy in ultrathin epitaxial films grown on surfaces vicinal to Cu(001)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Strain-phase relations in lead-free ferroelectric KxNa1-xNbO3 epitaxial films for domain engineering
… thesis is to demonstrate the potential of thin films for technical applications by tuning the ferroelectric film properties on the basis of the strain-phase diagram. For this purpose, a fundamental understanding of the relation between incorporated lattice strain by epitaxial growth of thin …
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Growth of Wurtzite Gallium Nitride Epitaxial Films on Sapphire Substrate by Reactive Molecular Beam Epitaxy and Material Characterization
For the growth of n-type films, a specific ammonia flow rate (or V/III ratio if Ga flux is fixed) was required to obtain films with high electron Hall mobility. X-ray diffraction (XRD), photoluminescence (PL), cross-sectional transmission microscopy (XTEM) and deep level transient spectroscopy …
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Novel magnetic behavior in heavy rare earth superlattices
… and magnetic properties of heavy rare earth films and superlattices synthesized by molecular beam epitaxy are investigated. Epitaxial films of rare earth metals, and superlattices of rare earths with Y interlayers, are grown along different hcp orientations using novel techniques developed …
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Electrodeposition of epitaxial metal thin films on silicon for energy conversion and flexible electronics
<p>"This research focuses on epitaxial electrodeposition of two coinage metals: Au and Ag thin films on the silicon surface and their applications in flexible electronics and energy conversion and storage. The first paper: <em>Photoelectrochemistry of ultrathin, semi-transparent, and catalytic gold …
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Polarity governs atomic interaction through two-dimensional materials
… Recently, precise atomic alignment between epitaxial films and substrates through monolayer graphene has been discovered in a GaAs/graphene/GaAs structure. This finding experimentally confirms the existence of remote atomic interaction through graphene. However, the mechanism of remote …
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Two-dimensional and three-dimensional magnetism in ultrathin epitaxial rare-earth metal films
… of the magnetic behavior of ultrathin epitaxial films of the heavy rare-earth elements; Gd, Er, and Dy, grown with the technique of Molecular Beam Epitaxy (MBE). By employing advanced film fabrication techniques, each magnetic rare-earth element layer, between 0.1 and 10 atomic layers …
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Magnetic studies of epitaxial neodymium
… properties. Early studies of Nd prepared epitaxially as thin films with either nonmagnetic yttrium (Y) or magnetic praseodymium (Pr) demonstrated magnetic properties hitherto unforeseen. To probe the newly discovered phenomenon, thin films of Nd and NdY alloys have been prepared in one of …
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Growth of epitaxial nanoscale columnar copper indium diselinide thin films by introduction of sodium flouride during growth
The effect of NaF on the growth of CuInSe2 (CIS) epitaxial thin films by a hybrid sputtering and evaporation method was studied. Low levels of NaF deposition during interruptions of epitaxial growth reduced surface roughness. Larger amounts of NaF resulted in columnar epitaxial films with <112> …
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Epitaxial Nd-Fe-B films: Growth, texture, magnetism and the influence of mechanical elongation
… in this thesis focuses on the preparation of epitaxial Nd-Fe-B thin films using pulsed laser deposition for good hard magnetic properties. They are suitable for a basic understanding of the intrinsic magnetic properties. Compositional control was necessary to achieve phase formation with …
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Two-dimensional material based layer transfer of thin film devices
… remote epitaxy. This thesis explores remote epitaxial growth of compound semiconductors on a graphene coated substrates and exfoliation of epitaxial films grown on graphene. Due to the atomic-thickness of graphene and weak van der Waals interaction on the surface of graphene, semiconductor …
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Magnetic and critical behavior of thin terbium(0001)/tungsten(110) films studied by electron capture spectroscopy (ECS)
Epitaxial films of hcp Tb(0001) on bcc W(110) substrates are prepared and their geometric, electronic and magnetic properties are studied. The atomic flatness and cleanness and the single-crystalline state of the W(110) substrates and the Tb films are checked using scanning tunneling microscopy …
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Nucleation and Growth of Order in Cu(3)Au (111) Films
During epitaxial growth of (111) face-centered cubic crystal films, such as disordered $\rm Cu\sb3Au,$ there are two possible ways that successive layers can be laid down, leading to two types of stacking domains. However, a small vicinal miscut $(0.5\sp\circ {-}1\sp\circ )$ of the crystal surface …
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Epitaxial electrodeposition of metal oxide films and superlattices which exhibit resistance switching
… of the electrodeposition of metal oxide films and superlattices on conducting polycrystalline and single crystal substrates. In the first part of the study, electrodeposition of magnetite (Fe₃O₄) films and superlattices in the magnetite/zinc ferrite system which exhibit resistance …
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High-throughput synthesis of functional oxide films
… epitaxy (CSE), where an oxide film is grown epitaxially on a polycrystalline substrate. As a proof-of-concept, we firstly fabricated Ca3Co4O9 films on Al2O3 ceramics. Films have a good local epitaxial registry, and the Seebeck coefficient is about 170 µV/K at 300 K. High quality …
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Interaction of stress and magnetic properties in patterned copper-nickel-copper thin films
In recent years, the epitaxial Cu/Ni/Cu thin film system has been extensively studied, due to its wide range of perpendicular magnetization. It has proved to be a model system to explore the interactions of strain, surface energies and magnetic properties. For that reason, is also an ideal system …
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Sustainable Heusler and Antiferromagnetic Thin Films for High Density Data Storage
… (spintronics). This thesis investigates thin films of Fe/Mn/Al based Heusler alloys and antiferromagnetic Mn$_3$$\it X$ ($\it X$ = Sn, Ga) as new materials for spintronic devices. Heusler alloys offer a very promising platform to tailor physical properties of materials through element …
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Resistance in Superconducting Epitaxial Niobium Nanowires
… are fabricated from single-crystal niobium films grown by ultra-high vacuum molecular beam epitaxy. Since the resulting wires are single-crystal and homogenous, the role of disorder is reduced and neither weak links nor grain boundaries dominate the observed DC resistance at low temperature. …
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