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 24 for “"spin injection"”.
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Spin injection and manipulation in organic semiconductors
… use of organic semiconductors to enable organic spintronic devices requires the understanding of transport and control of the spin state of the carriers. This thesis deals with the above issue, focusing on the interface between the organic semiconductor and the spin source. The morphology of the …
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Ultrathin films on semiconductor substrates : growth, magneto-optical characteristics and spin injection
… mostlikely candidates to achieve an efficient spin injection at room temperature, which isone of the essential requirements for spintronics devices.The work presented focused on a study of the ferromagnetic film-semiconductorheterostructures, especially their magneto-optical properties and spin …
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Spin Currents in Organic Semiconductors
… recently been found to have a comparably large spin diffusion time and length. This makes them ideal candidates for spintronic devices. However, spin injection, transport and detection properties in organic materials have yet to be fully understood. This work studies spin injection from …
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Theory and simulation of magnetism and spin transport in semiconductors
<P>A THEORETICAL MODEL OF SPIN-TRANSPORT IN FERROMAGNET-SEMICONDUCTOR HYBRID STRUCTURES WHICH TAKES INTO ACCOUNT THE EFFECTS OF INTERFACE RESISTANCE HAS BEEN PRESENTED. SPIN-INJECTION EFFICIENCY AND MAGNETORESISTANCE WHICH ARE THE KEY PARAMETERS IN ANY SPINTRONICS DEVICE ARE STUDIED IN DETAIL. IT …
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Thermal Effects on Spin Currents in Non-Local Metallic Spin Valves
<p>The study of non-local spin valves (NLSVs) has recently proven to be a fertile area for both applied and fundamental research in nanomagnetism due to the unique ability to separate charge currents and spin currents. NLSVs may also prove essential for a new class of high-density hard disk read …
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Spin Transport in Organic Semiconductors
… potential for use in solid state devices for spintronics and spin-based information processing. Organic semiconductors composed of mainly light elements appeal to the field of spintronics due to their long spin lifetime originating from their weak spin-orbit coupling. The significant progress …
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Electrodeposited Ni/Ge and germanide schottky barriers for nanoelectronics applications
… junctions could be used for hot electron injection in transferred-electron devices. A vertical Co/Ni/Si structure has been fabricated for spin injection and detection in Si. It is shown that the system functions electrically well although no magnetoresistance indicative of spin injection …
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Time resolved electrical injection of coherent spin packets through a Schottky barrier
… few years, the manipulation of the electron’s spin degree of freedom for information processing was explored in the new field of spintronics. Future spintronic devices rely on the generation of a spin imbalance in a semiconductor. Electrical spin injection from a ferromagnet into a …
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Quantum gas microscopy of strongly correlated fermions
… be divided into two areas. The first concerns spin-orbit coupling; the second concerns quantum gas microscopy. With the use of Raman transitions, ID spin-orbit coupling of ultracold 6Li was realized. Using a novel type of spectroscopy, spin-injection spectroscopy, where the spin, energy, and …
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Electrical injection and detection of spin polarization in InSb/ferromagnet nanostructures
We present studies of the electical detection of spin injection and transport in InSb/CoFe heterostructures. As a narrow gap semiconductor, InSb has a high mobility and strong spin-orbit interaction. Using ferromagnetic CoFe, lateral InSb/CoFe devices are fabricated by semiconductor processing …
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Nonlinear Dynamics of solitary and optically-injected spin vertical-cavity lasers
… dynamics and polarisation properties of Spin-Vertical-(External)-Cavity Surface-Emitting Lasers (V(E)CSELs). The focus is on gaining a broad understanding of the various polarised resolved nonlinear dynamical effects in solitary and injected 1300 nm spin-V(E)CSELs. We report a …
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Towards building a prototype spin-logic device
… storage. In particular, the discovery of Spin-Transfer Torque (STT) has allowed information to be written to individual magnets using spin-currents. This has replaced the more traditional Oersted-field control used in field-MRAMs and allowed further scaling of magnetic-memories. A less …
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Zinc Oxide based Diluted Magnetic Semiconductors
… to be of importance in the emerging field of spintronics where the charge as well as the spin of the charge carriers can be combined to yield unique functionalities to yield novel devices including, on-chip memories, ultra-low power devices etc. The material of interest in this dissertation …
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Spin transport in few-layer graphene
Graphene spintronics refers to spin injection, spin transport and spin detection, using magnetic electrodes and single/multilayer graphene. Although it has been very actively researched since 2006, there is still disagreement regarding the spin diffusion length (lsf). This is partially because …
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First Principle Modeling of Hybrid Halide Perovskites for Optoelectronic Applications
… coupling. Relativistic effects are studied using spin orbit coupling (SOC) corrections to account for large atoms like Pb and I. The Rashba effect is seen when SOC corrections are added which implies inversion symmetry breaking and momentum dependent photoexcitation, both of which were confirmed …
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Low temperature Kerr effect study of magnetic topological insulators and other magnetic structures
Spintronic technology utilises the spin of electrons as an extra degree of freedom to store and process information in microelectronic devices. Of special interest among all spintronic materials are topological insulators (TIs), which have insulating bulk but conductive surface states. In this …
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The study of weak ferromagnetism by andreev reflection spin spectroscopy and development of bimorph electro-thermal actuators
<p>It is well accepted that spin polarization of materials has a major role in spintronics to improve the efficiency of spintronic devices. Point contact Andreev reflection (PCAR) spectroscopy, one of the most popular and reliable techniques, was used to obtain the conductance and by analyzing them …
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Control of Superconductivity in Cuprate/Manganite Heterostructures
Research has shown that the spin alignment in an adjacent ferromagnet is capable of suppressing superconductivity. In this project, devices incorporating cuprate/manganite heterostuctres were successfully fabricated to study the effects of spin transport on the high temperature superconductor, YBCO. …
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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
Systems with strong spin-orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest …
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Non-equilibrium spin accumulation in Co2FeMnSi/n-GaAs heterostructures
… thesis describes our studies of non-equilibrium spin accumulation in ferromagnet/n-GaAs heterostructures. This work naturally separates into two main topics: the first is the study of the non-equilibrium electron spin accumulation which is generated electrically by passing a current across the …
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