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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 23 for “"Magnetic Domains"”.
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Skyrmions and non-collinear magnetic domains in Fe₃GeTe₂
… der Waals (vdW) material known to host nanoscale magnetic whirlpools called skyrmions. The vdW nature of Fe3GeTe2 means we can exfoliate 2D layers that can be easily incorporated into a wide range of devices. Behaving as particles that can be manipulated, skyrmions are potentially useful for …
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Fabrication of nanoscale magnetic domains using block-copolymer lithography
… creating patterns that can be transferred onto magnetic media. The aim of this study was to determine optimal BCP film thicknesses that produce spherical micro-domains with long range order on a Co substrate brushed with PS-OH and to transfer this pattern onto the underlying Co. Thin films of …
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Low-temperature magnetic force microscopy with a simple design: analyzing the magnetic domains of a simple hard disk drive
… introduces the theoretical background for the Magnetic Force Microscope (MFM) and the theoretical basis for magnetic domains. The second part will address issues we have come across on previous designs and how our newer design overcomes these issues. Along with the construction of our low …
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Three-dimensional magnetic domain imaging with polarized neutrons
Application and fundamental understanding of magnetic materials requires knowledge of their properties and phase diagrams, which depend on the structure and dynamics of magnetic domains. Current techniques for studying magnetic domains are limited to imaging near-surface magnetic structure. …
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Fabrication of nanostructured surfaces with well-defined chemistry using particle lithography
… microscopy (AFM) were developed for mapping magnetic domains and elastic compliance at size regimes below 100 nm. The AFM-based imaging mode is referred to as magnetic sample modulation (MSM). The AFM tip serves as a force and motion sensor for mapping the vibrational response of magnetic …
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Magnetic and thermal properties of metallic antiferromagnetic materials
Metallic antiferromagnetic materials are of great potential in spintronics due to their insensitivity to external fields and faster dynamics compared to typical ferromagnetic materials. Although they have these advantages, studies of their order parameter is difficult to perform because of the lack …
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Structure-Property Relationships of Multifeorric Materials: A Nano Perspective
… are driven by electric fields (ferroelectrics), magnetic fields (ferromagnetics), or mechanical stress (ferroelastics) as they transform from nonferroic to ferroic states, contributing to the sensing and actuating capabilities. This research focuses on two multiferroic crystals, …
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Nanostruktūrizuotų manganitų kobaltitų sluoksnių magnetovaržinės savybės /
… processes in these films after switching-off the magnetic field and the origin of phenomena determining these processes were studied. The influence of long term and accelerated aging of the films on their magnetoresistive properties were investigated. It has been found that cobalt doping of …
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Design of a high-speed, meso-scale nanopositioners driven by electromagnetic actuators
… nanopositioners that are driven by electromagnetic actuators. When compared to macro-scale nanopositioners, meso-scale nanopositioners enable a combination of greater bandwidth, improved thermal stability, portability, and capacity for massively parallel operation. Meso-scale …
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Magnetism in crystalline rare-earth compounds
… a well established tool for determining magnetic structures, has been employed in order to determine two magnetic structures of the intermetallic R2CoGa8 series. This was the first such study of these materials, which are of great interest as the magnetic exchange interactions of the …
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Statistics In Diffractive Imaging
… imaging with unoriented data and ultrafast magnetic imaging with unmeasured charge distribution, both of which are exciting experiments planned for free electron laser facilities. Concerning single particle imaging, in chapter 2 we introduce the EMC algorithm for reconstructing a particle's …
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Investigating approaches to enhance sensing capabilities of nitrogen-vacancy centres in nanodiamond
… proven to be an excellent tool to probe electro-magnetic fields and temperature. It has a number of unique features: High sensitivity and resolution, long coherence and lifetimes, the ability to operate from cryogenic temperatures to hundreds of Kelvin, chemical inertness and addressability via …
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Synthetic morphogenesis : space, time, and deformation
… mathematical principles from classical models of magnetic domains and phase separation. The problem again becomes a form of distributed constraint propagation, now using soft constraints. I explore some of the resulting phenomena and then apply the mechanism to crafting surface geometries, where …
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Magnetic thin films For spintronic memory
… of spatially non-uniform magnetizations in magnetic materials. They form the boundaries between two or more uniformly magnetized regions called domains. Skyrmions are circular magnetic domains with chiral domain walls that are interesting due to their stability and potential for fast motion. …
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Multiscale approaches on two-dimensional magnetic materials: from atomistic to mesoscale level
… 2D is a smooth continuation from low-dimensional magnetic materials, or if new physics and magnetic behaviour arise due to the reduced dimension.<br/><br/>In this thesis, we present an investigation of 2D magnetism through the use of a multiscale approach involving atomistic scale models with …
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Magnetic Microstructure and Actuation Dynamics of NiMnGa Magnetic Shape Memory Materials
Magnetic shape memory (MSM) materials are a new class of smart materials which exhibit shape deformation under the influence of an external magnetic field. They are interesting for various types of applications, including actuators, displacement/force sensors, and motion dampers. Due to the huge …
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High Frequency Behaviour of Magnetic Thin Film Elements for Microelectronics
Magnetismus ist ein Phänomen, das eine wichtige Rolle in einer Vielfalt technischer Anwendungen spielt. Ohne den Einsatz magnetischer Effekte und Materialen wäre der heutzutage erreichte technische Fortschritt unmöglich, da viele grundlegende Techniken wie Stromerzeugung, elektrischer Antrieb, …
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Compositional tuning, crystal growth, and magnetic properties of iron phosphate oxide
… Fe3PO4O3, is a crystalline solid featuring magnetic Fe3+ ions on a complex lattice composed of closely-spaced triangles. Previous work from our research group on this compound has proposed a helical magnetic structure below T = 163 K attributed to J1-J2 competing interactions between …
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Crystal growth of functional oxides using an image furnace
… a solid state reaction) also indicated that the magnetic properties depend upon the material preparation conditions. An oxygen deficient environment during the preparation of Co-doped TiO\(_2\) powders and single crystals was crucial for the observation of room temperature ferromagnetism, since …
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