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 20 for “"Spin Valves"”.
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Spin transport through nanopillar superconducting spin valves
… into the interaction of non-equilibrium spin currents with superconductivity using spin valves, where the difference in resistance between the antiparallel (AP) and parallel (P) alignments of the magnetic layers within the device [magnetoresistance, ∆R = RAP − RP ] has been used to …
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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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Resistance noise in giant magnetoresistive materials
… 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 use the out-of-phase response of the resistance to a magnetic field in an …
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Energy efficient hybrid computing systems using spin devices
<p>Emerging spin-devices like magnetic tunnel junctions (MTJ's), spin-valves and domain wall magnets (DWM) have opened new avenues for spin-based logic design. This work explored potential computing applications which can exploit such devices for higher energy-efficiency and performance. The …
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Size Effects on Transport in Graphene
… studies the size effects on the electron and spin transport properties of graphene: two of the fundamental aspects of graphene-based electronic devices. Two types of devices: graphene field-effect transistors and graphene lateral spin-valves were manufactured by top-down nanofabrication. With …
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Kopplungen und Riesenmagnetowiderstand (GMR) in Mehrlagensystemen für die Magnetosensorik
… verantwortlich. Diese werden diskutiert. Spin Valves bestehen aus Einzellagen unterschiedlicher Materialien (antiferro-, ferro- und paramagnetisch), meist Metalle, die eine Widerstandsänderung mit der Richtung des externen Magnetfeldes zeigen. Untersucht wurden Systeme, die auf NiO, FeMn …
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Magnetic structures and proximity effects in rare-earth / transition metal ferromagnetic and superconductor systems
… multi- layers were previously used as spin-mixers to generate spin-triplet su- percurrents. This was possible due to magnetic inhomogeneity present in the devices, however the precise nature of the inhomogeneity was not understood. Here we present a comprehensive study of the Ni/Gd/Ni …
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Spintronic and plasmonic applications of electrodeposition on semiconductors
… the prospects of applications in the area of Spintronics and Plasmonics.<br/>Firstly, the excellent current-voltage and capacitance-voltage characteristics of electrodeposited Schottky barriers indicate that they have an ideality factor close to unity and that the reverse bias leakage is …
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Investigations of Crossed Andreev Reflection in Hybrid Superconductor-Ferromagnet Structures
… The first devices studied are lateral spin valves. In these structures, when electrons with energies less than the superconducting energy gap are injected from one ferromagnetic wire into the superconductor, nonlocal transport processes involving the second ferromagnetic wire are …
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Spin pumping measurements at interfaces between magnetic metal or insulator and organic semiconductors
Over the last 16 years, organic spintronics has developed into a striving field with exciting reports of extremely long spin diffusion lengths and spin relaxation times in organic semiconductors (OSCs). Easily processed and inexpensive, OSCs are a strong alternative to inorganic materials for use …
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Spin-triplet proximity effects in magnetically controlled heterostructures with s-wave superconductors
… due to the rapid depairing of conventional spin-singlet Cooper pairs in the presence of a magnetic exchange field. Over the last decade-and-half, experimental evidence has emerged for the generation of spin-triplet Cooper pairs, which have parallel aligned spins, and are therefore compatible …
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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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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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Metallic Magnetic Hetrostructures
This work studied sputter deposited conventional spin valves (SV) and related structures. In SV layered structures, two ferromagnetic layers are separated by a non-magnetic spacer. Under an external magnetic field, the relative orientation of the magnetization changes in the ferromagnets, …
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In situ magnetoresistance measurements during patterning of spin valve devices
… study on the patterning of thin films and spin valve devices. Initially the change in the magnetisation reversal of ferromagnetic Ni$_{80}$Fe$_{15}$Mo$_{5}$ thin films was investigated as the shape anisotropy was increased using optical lithography to pattern wire arrays. These structures …
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Co2MnSi Heusler alloy thin films
… that there is an energy gap in the minority spin band at the Fermi energy. This leads to 100 % spin polarised conduction electrons, which would enable ideal spin-device performance to be obtained. Co2MnSi is particularly promising because it is predicted to have a large energy gap in the …
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Spin and Charge Transport in Metallic Ferrimagnets and Disordered Magnetic Oxides
… disordered magnetic oxides for applications in spintronic devices. Due to the antiferromagnetic exchange interaction, ferrimagnetic materials offer the ultrafast dynamics of the antiferromagnetic exchange, with a net magnetization that can be influenced externally. With two, or more, competing …
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Sustainable Heusler and Antiferromagnetic Thin Films for High Density Data Storage
… and capacity concerns in the field of spin transport electronics (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 …
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Noise detection and transport measurements of spin valve systems.
Electronic noise not only limits the performance of magnetic devices in practical applications but also provides valuable physical insights into these devices. The first part of this thesis discusses how the low frequency noise in magnetic tunnel junctions and giant magnetoresistance devices can be …