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 159 for “"magnetoresistance"”.
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Giant Magnetoresistance in Multilayers
… angular dependence of the conductance and giant magnetoresistance in spin-valve structures. The conductance, due to both minority and majority spin channels, was calculated for arbitrary angles between the magnetizations of the magnetic layers. We found that the leading contribution to the …
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Magnetoresistance effects in metallic antiferromagnets
… in this thesis is focused on characterizing the magnetoresistance of various metallic antiferromagnets to better understand the relationship between metallic conductivity and spin textures in these materials. Specifically, we studied anisotropic magnetoresistance (AMR) and unidirectional …
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Giant Magnetoresistance - eine ab-initio Beschreibung
… 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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Measurements of magnetoresistance in amorphous alloys
Magnetoresistance data are presented on amorphous films of Gel Au, 8 Au, -x x 1-x x onto 10K sapphire substrates. Zero-field conductivity measurements show no systematic differences between the materials; magnetoresistance data reveal that the influence of spin-orbit coupling on the conductivity …
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Characterization of the magnetoresistance of polypyrrole
… being used. This thesis presents a study of the magnetoresistance of the conducting polymer polypyrrole. It was found that the electrical resistance of polypyrrole wires is not correlated to the strength of a perpendicular magnetic field, but exhibits a large dependence on the operating …
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Magnetoresistance and ion bombardment induced magnetic patterning
… of the unidirectional anisotropy and the tunnel magnetoresistance effect is investigated. In my diploma thesis, it has been shown that it is in principle possible to use the magnetic patterning by ion bombardment to magnetically structure the pinned layer in magnetic tunnel junctions (MTJs) with …
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Designing a Method for Measuring Magnetoresistance of Nanostructures
… platform that will accurately measure tunneling magnetoresistance (TMR) in nanosized Magneto-tunneling Junctions (MTJ). The testing done with this system at various stages throughout the design and testing process confirm the expectations for the performance of the system. Voltage-current …
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Magnetoresistance and Thermoelectricity in Quasi-Low Dimensional Semimetals
… a commensurate resonance effect in the angular magnetoresistance which can be understood as 1D to 2D crossovers of quasiparticle motion.
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Study on graphene-based nanocomposites with special magnetoresistance properties
Magnetoresistance (MR) refers to the change of a material’s electrical resistance under the presence of an external magnetic field. The discovery of new MR phenomena (e.g., giant magnetoresistance (GMR) and tunneling magnetoresistance (TMR)) since the 1980s initiates the revolution of novel …
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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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Mesoscopic noise probe of an inhomogeneous colossal magnetoresistance phase
… in the region of phase space where colossal magnetoresistance effects are strongest. The fluctuators' dependence on magnetic field indicates that the resistance steps represent small regions of material fluctuating between a paramagnetic insulating phase and a ferromagnetic conducting phase. …
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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
… unveiled a net enhancement of the giant magnetoresistance effect thru the whole range of the copper spacer thicknesses deposited with direct current magnetron sputter. The maximum net increase appeared for a spacer thickness of 4.0 nm where the flat silicon substrate yielded a 3 % …
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Electrodeposition of multilayered nanostructures for giant magnetoresistance and thermoelectric applications
… electrodeposition is the investigation of giant magnetoresistance (GMR), a change in the material resistance in an applied magnetic field as a consequence of antiferromagnetic coupling. The nanowire high aspect ratio geometry allows the measurement of GMR with the current applied perpendicular to …
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Exchange coupling and giant magnetoresistance in nickel-iron/copper multilayers
… 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 the …
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In situ magnetoresistance measurements during patterning of spin valve devices
… be ideal to design a technique to do in-situ magnetoresistance measurements during milling. This meant that the samples could be milled and characterised in the same step, leading to a much cleaner and more efficient process. In-situ magnetoresistance measurements were carried out during …
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