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 37 for “"spin valve"”.
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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 …
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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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Spin-torque induced high frequency excitations and switching in spin-valve nanocontacts
This thesis presents a novel spintronic design of a nano-sized high frequency oscillator, which is a cutting edge physics research field with a huge potential for future applications in the areas of mobile telecommunication and information- as well as in biomedical-technologies. In this device, a …
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Field and current induced magnetization reversal in patterned Pseudo Spin Valve devices
… induced magnetization switchings of Pseudo-Spin-Valve (PSV) devices are described in this dissertation. An aligned sequence of three (one optical and two electron-beam) lithographies was used to define the devices and their electrical contacts. The PSV stack comprised a layer of soft …
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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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Magnetotransport effects in lateral and vertical ferromagnetic semiconductor junctions
… Tunneling Anisotropic Magnetoresistance: A Spin-Valve-Like Tunnel Magnetoresistance Using a Single Magnetic Layer, Physical Review Letters 93, 117203 (2004). [3] C. Rüster, C. Gould, T. Jungwirth, J. Sinova, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Very Large …
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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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Magnetic properties of lithographically patterned thin film magnetic elements for magnetic random access memory applications
… layer Co, NiFe, and multilayer Co/Cu/NiFe pseudo spin valve films have been patterned into series of element arrays with different sizes. With the aim of assessing the behavior of future magnetic random access memory (MRAM) devices, the magnetic properties of the patterned elements, including …
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DNA Electronics
… We predict, using a tight-binding model, that spin-dependent transport can be observed in short DNA molecules sandwiched between ferromagnetic contacts. In particular, we show that a DNA spin-valve can be realized with magnetoresistance values of as much as 26% for Ni and 16% for Fe contacts. …
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Half metallic Fe3O4 : An experimental study on impurity doping and the giant magnetoresistance effect
… systems for potential applications in oxide spintronics. A systematic analysis of the evolution in microstructural, magnetic and magnetotransport properties of Co and Cu doped Fe3O4 films is presented and marked changes are observed as the impurity concentration is varied, due to substitution …
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NOVEL TYPES OF TWO-DIMENSIONAL METAL CARBIDES AND THEIR APPLICATIONS: FIRST PRINCIPLES STUDIES
… and oxygen reduction/evolution reaction) and spintronic devices (including spin filter and spin valve) are systematically studied.
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Development of magnetic tunnel junction (MTJ) sensors for the detection of single magnetic particles
… magnetoresistive biosensor have been conducted. Spin valve-type biosensors and GMR biosensors are the most common biosensor types used 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 …
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Nanoscale Josephson Devices
… using γ-Fe50Mn50 as the barrier. ‘Pseudo-spin-valve’ Josephson junctions were also created using a Co/Cu/Fe20Ni80 barrier. In this case the relative orientation of the magnetic moments of the Co and Fe20Ni80 could be changed with an applied magnetic field. The magnetoresistance and critical …
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SPIN AND CHARGE TRANSPORT IN 2D MATERIALS AND VAN DER WAALS HETEROSTRUCTURES
… field as well as BKT transition. Secondly, spin-polarized tunnel spectroscopy of NbSe2 is presented. The tunnel spectra strongly depend on the magnetization configuration of the tunnel contacts. The result is drastically different from a similar experiment on aluminium, suggesting the …
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Understanding magnetic field reversal mechanisms in mesoscopic magnetic multilayer ring structures
Patterned pseudo spin-valve rings show great promise for device applications due to their non-volatility and variety of stable magnetic states. However, the magnetic reversal of these elements under an applied field is complex due to the magnetostatic coupling between the two ferromagnetic layers. …
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Study of vdW Magnetic Materials for Spintronic Applications
… materials for their application in developing spintronic devices to form the building blocks of neuromorphic and stochastic computing architectures. Use of correlated systems like ferromagnets provides a way towards low energy device switching, while 2D nature of the materials provides an …
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Fabrication and characterization of novel nanostructures based on block copolymer lithography
… behavior of the antidot arrays of Co and pseudo-spin-valve structures with periodicity of 26 nm and 40 nm.
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Superconducting Proximity Effects and Josephson Coupling in CoFeB Structures
… research and application in ‘superconducting spintronics’ - the field that aims to utilise the distinct physics arising at interfaces between superconducting and magnetic thin films for the development of functional memory and logic devices. Following a review of the current field and an …
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Magnetic properties of small multi-layered rings
… 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 and applied field are …
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