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 29 for “"Magnetic Devices"”.
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Reduction of Dynamic Nonlinear Models of Magnetic Devices
… any heuristic approximation in modeling the magnetic devices, and the technique results in easy-to-simulate, physics-based models. The mathematical framework for FEM-MOR is set up in the context of the analysis of the magnetic devices. This work provides a foundation for modeling more …
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High-Frequency Dimensional Effects in Ferrite-Core Magnetic Devices
… in MnZn ferrite helps to minimize the size of magnetic devices while maintaining high efficiency. The continuing improvement in semiconductor switches and circuit topologies has led to use of high-frequency switching circuits at ever increasing power levels. The magnetic devices for these …
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Incorporation of Hysteretic Effects in Model-Order Reduction Analysis of Magnetic Devices
The ability to predict the properties of magnetic materials in a device is essential to ensuring the correct operation and optimization of the design as well as the device behavior over a wide range of input frequencies. Typically, development and simulation of wide-bandwidth models requires …
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Planar Magnetics Design For Low-voltage Dc-dc Converters
… objectives of this thesis are to design planar magnetic devices based on accurate electromagnetic analysis and miniaturize magnetics within desired low profile as well as small footprint. A novel methodology based on FEM simulation is proposed. By introducing Maxwell 2D simulator, optimal …
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The effects of polydispersity on the morphology of polystyrene-polyferrocenyldimethylsilane block copolymer thin films
Introduction: As the size of electronic and magnetic devices decreases, nanoscale patterning becomes an increasingly important area of research. Two different approaches have been taken to pattern media: top-down methods such as lithography, and bottom-up methods such as self-assembly. Top-down …
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The electrodynamics of high frequency magnetics in power electronics
The electromagnetic behavior of magnetic devices used in power electronics circuitry, is studied in order to predict their performance within a context of desirable circuit parameters. Past efforts have focused on simplifications widely used in electric machinery applications. Due to the greatly …
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Noise detection and transport measurements of spin valve systems.
… 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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Interaction of stress and magnetic properties in patterned copper-nickel-copper thin films
… the interactions of strain, surface energies and magnetic properties. For that reason, is also an ideal system to explore the effects of patterning. It is expected that the miniaturization of patterned magnetic devices will be accompanied by a transition from polycrystalline to epitaxial films. …
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Magnetoelectric Effect in Ferroelectric-Ferromagnetic Heterostructures
… (ME) effect, a coupling effect between magnetic and electric orders, has been widely investigated, both from a fundamental science perspective and an applications point of view. Magnetoelectric composites with one piezoelectric phase and one magnetostrictive phase can be …
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Metallic Magnetic Hetrostructures
… 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, exhibiting the giant magnetoresistive effect. The controlled switching of …
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Development of Nanotemplates and Nanomagnetic Materials for Data Storage Applications
… Particularly, research and development of magnetic devices for data storage applications has made significant technological impacts for the past four decades. Our society has greatly benefited from the significant downsizing and increased performance of data storage technology. To improve …
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Magnetic logic circuits with high bit resolution for hardware acceleration
… circuits. We explore a logic device based on magnetic domain walls, which are electrically movable boundaries between oppositely magnetized domains of a wire, for applications to hardware acceleration. A domain wall logic device takes current on the input, which moves a magnetic domain wall to …
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PROBING BAND MAGNETISM IN DIFFERENT DIMENSIONS: ENERGY, SPIN AND TIME-RESOLVED STUDIES
… of high interest in modern and next-generation magnetic devices. In the three systems I studied the electronic band structure to identify key features hinting at the bound electrons behaviour. I investigated the properties of the magnetically ordered phases and found evidence of the reduced …
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Perpendicular magnetic anisotropy in ion beam sputtered Co/Ni multilayers
Co/Ni multilayers display perpendicular magnetic anisotropy and have applications in magnetic devices that could lead to a large increase in the density of magnetic storage. Co/Ni 10-(2 Å Co/ 8Å Ni) and 10-(2 Å Co/ 4 Å Ni) multilayers were deposited with ion beam sputtering on either ion beam …
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Characterization of nano-arrays fabricated via self-assembly of block copolymers
… materials for applications in electronics, magnetic devices, as well as sensors and filters. Polystyrene-poly(ferrocenyldimethylsilane) block copolymer thin films were characterized in terms of their spin curves, PSF spherical domain cross sectional area distributions, and correlation …
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Optimization of magnetic thin films for generating stable chiral magnetic structures
… stability, low energy and low current in magnetic devices make them attractive for memory storage, sensors and computing. Their effectiveness is limited by the current, density, and device size, which can be optimized by tuning the magnetic materials properties. In this thesis, we show the …
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Structure–Property Relationships in Hybrid Crystalline Materials for Multifunctional Light–Matter Interactions
… concept to multiferroic systems, where electric, magnetic, and optical properties coexist and interact. By integrating chiral (handed) molecules with magnetic components, we develop materials that can detect and respond differently to left- and right-circularly polarized light, an important step …
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EPITAXIAL SPIN-ORBIT AND MAGNETIC MATERIALS FOR INTEGRATION ONTO A SEMICONDUCTOR PLATFORM
… systems are dominated by semiconductor devices that utilize the charge of the electron. Meanwhile, magnetic devices, based on the spin of the electron, have historically served as the backbone fordigital memory storage. In recent times, however, charge-based memories, such as flash and …
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Pulsed Laser Deposited Iron Garnet Thin Films for Spintronics
… damping and their growth with perpendicular magnetic anisotropy (PMA) which promote fast domain wall dynamics. Additionally, selection of rare earth ion and substitution of cations in various sublattices of iron garnets enables tuning of their saturation magnetization, magnetocrystalline …
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Structure, magnetism and multiferroicity in self-assembled oxide nanocomposites
… to enhanced functionality in electronic and magnetic devices is often through materials engineering and the use of new materials structures. Oxides, in particular, exhibit a wide range of highly tunable properties due to the interplay of lattice, orbital, charge and spin degrees of freedom. …
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