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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 32 for “"Giant Magnetoresistance"”.
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Giant Magnetoresistance in Multilayers
… these multilayer systems is responsible for the giant magneto-resistance effect (GMR) and how GMR depends on the various parameters of the samples. The band structure was taken into account through a realistic third-nearestneighbor tight-binding model with s, p and d orbitals. The …
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Giant Magnetoresistance - eine ab-initio Beschreibung
… erstmalig eine parameterfreie Beschreibung des Giant Magnetoresistance (GMR) vorgelegt, welche detaillierte Einsichten in die mikroskopischen Vorgänge gestattet. Die ab-initio Berechnung der Elektronenstruktur der magnetischen Vielfachschichten basiert auf der Spindichtefunktionaltheorie unter …
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Giant Magnetoresistance and Quantum Transport in Magnetic Hybrid Nanostructures.
Technological advances in device micro- and nano-fabrication over the past decade has enabled a variety of novel heterojunction device structures to be made. Among these, magnetic multilayers, superconductor/normal metal junctions and carbon nanotubes exhibit a rich variety of features, with the …
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Giant magnetoresistance in electrodeposited nickel-copper and cobalt-copper multilayers.
Giant magnetoresistance measurements and x-ray diffractograms of both nickel-copper and cobalt-copper multilayer systems are contrasted with each other and compared to theoretical predictions, in order to determine the superlattice structure and electromagnetic properties of each. The results …
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Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface
Previous research on new novel substrates for giant magnoresistance structures has indicated that a net increase in the effect is present. The substrates studied were V-grooved or stepped, however research presented in this thesis used an embossed surface manufactured from alumina oxide which …
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Electrodeposition of multilayered nanostructures for giant magnetoresistance and thermoelectric applications
… novel materials such as multilayer nanotubes for giant magneto resistance (GMR) applications and bismuth telluride nanotubes for thermoelectric applications are presented in this dissertation. The motivation for the multilayer electrodeposition is the investigation of giant magnetoresistance …
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Exchange coupling and giant magnetoresistance in nickel-iron/copper multilayers
In recent years interlayer exchange coupling and giant magnetoresistance (GMR) in transition metal ferromagnet/nonmagnetic multilayers have been extensively studied. Bilinear interlayer exchange favors the collinear alignment of the magnetization of adjacent ferromagnetic layers, oscillates with …
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Half metallic Fe3O4 : An experimental study on impurity doping and the giant magnetoresistance effect
… materials, and subsequently investigates the giant magnetoresistance (GMR) phenomenon in Fe3O4 incorporated multilayers and granular systems for potential applications in oxide spintronics. A systematic analysis of the evolution in microstructural, magnetic and magnetotransport properties of …
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Magneto-transport properties of giant magnetoresistive systems
To understand the cause of the giant magnetoresistance effect, we have systematically investigated magnetothermopower, magneto-thermal conductivity and magnetoresistivity in both ferromagnetic/non-magnetic multilayers and granular solids which exhibit the giant magnetoresistance effect.
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Resistance noise in giant magnetoresistive materials
… noise in a variety of systems exhibiting giant magnetoresistance (GMR) including coupled and uncoupled multilayers, spin-valves and granular systems. Large equilibrium 1/f noise in the resistance of these materials is associated with the GMR effect. One consequence was that we were able to …
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Design, fabrication, and characterization of magnetic nanostructures
… materials with metallic spacer layers showing giant magnetoresistance (GMR) were the technological basis used in the read-heads of hard disk drives. Similarly, tunnelling magnetoresistance (TMR), which is an effect typically larger than giant magnetoresistance, occurs when the metallic spacer …
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Granular Alloy Film Synthesis Using Ionized Cluster Beam Deposition
… alloys of this form are known to exhibit giant magnetoresistance. Due to its versatility, this film growth technique enables numerous further experiments in small particle behavior, cluster-surface interactions, and granular film properties.
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Transport phenomena in metallic nanostructures: an ab initio approach
… in der Vielfachschicht auf den Effekt des Giant Magnetoresistance wird untersucht. Die selbstkonsistente Berechnung der Streueigenschaften und die verbesserte Lösung der Boltzmann-Transportgleichung unter Einbeziehung der Vertex-Korrekturen stellen ein leistungsfähiges Werkzeug zur …
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Normal and superconducting many-body systems
… second Chapter we propose a novel mechanism for giant corrections to the transport quantities, including positive giant magnetoresistance, due to the presence of paramagnons in a weakly disordered metal. At low temperature and for finite impurity spin scattering, for a certain value, predicted …
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Magnetotransport effects in lateral and vertical ferromagnetic semiconductor junctions
This work is an investigation of giant magnetoresistance (GMR), tunneling magnetoresistance (TMR) and tunneling anisotropic magnetoresistance (TAMR)effects in (Ga,Mn) based ferromagnetic semiconductor junctions. Detailed results are published in the following articles: [1] C. Rüster, T. Borzenko, …
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Noise detection and transport measurements of spin valve systems.
… frequency noise in magnetic tunnel junctions and giant magnetoresistance devices can be used to understand the fundamental noise sources. Previously, the low frequency noise in these systems has been reported to have an enormously large magnitude when the magnetization switches. This was …
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Field and current induced magnetization reversal in patterned Pseudo Spin Valve devices
… flowed in plane (CIP) and the devices displayed giant magnetoresistance (GMR). Three different shapes were investigated: notched bars, elliptical rings and rhomboidal rings. In the bars, the notches provided strong pinning potential wells for transverse domain walls in the NiFe layer, which, upon …
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Magnetic properties of small multi-layered rings
… exchange bias bilayer or giant magnetoresistance (GMR) spin valve structure, and their magnetic and magnetoelectric properties were investigated. Exchange-biased elliptical rings show an interplay between shape anisotropy and exchange anisotropy. When both the exchange bias …
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Field induced switching in multilayer rhombic magnetic rings
… within the devices and their resulting effect on giant magnetoresistance (GMR). Contact configuration and angular dependence of applied field are also examined. Using submicron thickness rhombic rings with long axis dimension -1.5gjm, major loop magnetization sweeps were conducted, as well as …
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