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 45 for “"Tunnel Junction"”.
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The development of magnetic tunnel junction fabrication techniques
… temperature magnetoresistance (MR) in magnetic tunnel junctions in 1995 sparked great interest in these devices. Their potential applications include hard disk read head sensors and magnetic random access memory (MRAM). However, the fabrication of repeatable, high quality magnetic tunnel …
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Physics-based modeling of 850 nm Tunnel Junction VCSELs
L'abstract è presente nell'allegato / the abstract is in the attachment
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Magnetic tunnel junction devices and circuits for in-memory, neuromorphic and radiation hard computing
The magnetic tunnel junction is a memory device at the core of emerging magnetic random access memory technology. As CMOS technology is approaching its physical limits, spintronics, with benefits like non-volatility and normally-off behavior, is a promising candidate for next-generation artificial …
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Development of magnetic tunnel junction (MTJ) sensors for the detection of single magnetic particles
… in the detection of magnetic particles; Magnetic tunnel junction (MTJ) sensors and the detection of single magnetic particles are still very new. There are few publications on magnetoresistive biosensors and very little work that has been conducted based on magnetic tunnel junction. For this …
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Spectroscopic studies of high-temperature superconductors on planar tunnel junction devices and nanofabricated point contact junctions
… Two powerful methods for this investigation are tunneling spectroscopy and point contact spectroscopy. The tunneling spectroscopy directly probes the density of states whereas the point contact spectroscopy detects the sample properties via quasiparticle scattering. Two new approaches to …
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A study of surface roughness issues in magnetic tunnel junctions
This research focuses on the spin-dependent tunneling phenomenon in magnetic tunnel junction. Based on the free electron model, it is found that the tunneling magnetoresistance and the exchange coupling are greatly modified by introducing the interface roughness into the basic …
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Characterization of novel III-V semiconductor devices
This thesis presents the characterization of tunnel junctions and tunnel-junction-coupled lasers. The reverse-biased leakage current in a tunnel junction can be exploited to tunnel electrons from the valence band of one active region to the conduction band of a second active region. Thus, …
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Desarrollo de células solares de doble unión de GaInP/GaAs para concentraciones luminosas elevadas (Development of GaInP/GaAs dual-junction solar cells for high light concentrations).
… development of the monolithic GaInP/GaAs dual-junction solar cell for high concentration applications, including its theoretical analysis and modeling, and the experimental manufacture and characterization of the needed semiconductor structures grown by metal-organic vapour phase epitaxy …
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The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
A conventional scanning tunneling microscope (STM) provides topographical and tunneling spectra information of atomic structures. However, the extremely small lateral dimension of the tunneling filament is also responsible for locally exciting photon emission with low-energy electrons. By combining …
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Ballistic electrons : microscopy, spectroscopy, devices and luminescence
… for simulating electron injection from a tunnel junction emitter into a semiconductor collector is presented in detail and a few applications of this theory are described. Second, a method of treating ballistic electron transport through nano-scale heterostructures by considering …
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Dispersive phonon imaging in III-V semiconductors
… Experiments are performed with superconducting tunnel junctions and Al bolometers to probe both the high-frequency and low-frequency regimes, respectively. We find that large-k ballistic phonons give rise to distinct focusing patterns in all four types of crystals, with thicknesses varying …
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Novel Approaches to Power Scaling In Mode-Locked Laser Diode Based Ultrashort Pulse Sources
… in a single monolithic device via a thin tunnel junction. A simple two-section, narrow ridge laser which had 2 active regions that were cascaded together via a thin tunnel junction was used to demonstrate mode-locking in a device with a multi-active region structure for the first time. The …
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INVESTIGATION OF MATERIALS AND ANALYSIS TECHNIQUES FOR PERFORMANCE ENHANCEMENT OF PERPENDICULAR MAGNETIC TUNNEL JUNCTIONS
Perpendicular Magnetic tunnel junction (p-MTJ) is a promising candidate for future non-volatile memories. Some of the factors that are critical for the performance of p-MTJ are thermal stability, magnetic immunity against the external magnetic field and switching current (Ic). In this thesis, the …
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Designing plasmonic structures
… efficiency of metal-insulator-metal (MIM) tunnel junction detectors for use in the low THz. General conclusions about the efficacy of plasmonic structures, or the lack thereof, in these applications are discussed.
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Josephson Currents In Two-Gap Superconductor-Insulator- Superconductor Junctions
… of superconductor-insulator-superconductor (SIS) junction with two-gap superconductors such as MgB2 and iron superconductors, we study the microscopic structure of the Josephson current in a tunnel junction with a very narrow quasi-classical barrier. Also, the possibility of mid-gap states in …
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Silicon bottom subcell fabrication, loss analysis and shunt identification for two-terminal multijunction solar cells
Two-terminal multijunction solar cells are a promising technology to surpass the energy-conversion efficiency of commercial single junction devices. Multijunction solar cells that integrate silicon bottom subcells could allow cost-effective efficiency enhancements and further growth in the …
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Stochastic In-memory Computing Using Magnetic Tunnel Junctions
… – stochastic in-memory computing using magnetic tunnel junctions. By introducing thermally stable and unstable magnetic tunnel junctions as CMOS-compatible circuit building blocks, both general-purpose and application-specific in-memory computing accelerators can be synthesized, providing a …
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Nonequilibrium green function approach to elastic and inelastic spin-charge transport in topological insulator-based heterostructures and magnetic tunnel junctions
… on measuring voltage signal from a magnetic tunnel junction (MTJ) exposed to a microwave radiation in ferromagnetic resonance (FMR) condition. In Chapter 3 we found a possible explanation for the finite voltage signal measured from a tunnel junction consisting of only a single ferromagnet …
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Growth of spinel oxide thin films for high efficiency room temperature spin filtering
In this thesis, the potential of all-spinel oxide tunnel junctions in the field of spintronics has been investigated. In particular, the suitability of the metallic and superconducting LiTi2O4 as non-magnetic electrode in an almost defect-free CoFe2O4-based spin-filter tunnel junction has been …
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