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 15 of 15 for “"Magnetic imaging"”.
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Quantum magnetic imaging for DNA biophysical measurements
… due to photobleaching. In this thesis, a new imaging modality is developed that relies on ferro- magnetic probes of bio-mechanical orientation. Because a ferromagnet has an unchanging magnetic moment, imaging the re-orientation of a ferromagnetic probe attached to a single- molecule …
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Real-space magnetic imaging of the spinel MnV2O4
… understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these …
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Surface Modifications of Iron Oxide Nanoparticles for Magnetic Imaging and Diagnosis
Contrast agents are commonly used in magnetic resonance imaging (MRI) for their ability to selectively highlight or darken image brightness from different tissue components depending on their chemical nature. This work explores and discusses potential of colloidal iron oxide nanoparticles as …
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Pulsed Magnetic Imaging of Broad-Frequency Fields using Nitrogen-Vacancy Centers in Diamond
Wide-field magnetic imaging using nitrogen-vacancy (NV) centers in diamond can yield high-quality images for various applications, including biology, geology, condensed matter physics, and electronics troubleshooting. These quantum sensors yield widefield-of-view images with micron-scale spatial …
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Probing two-dimensional magnetic phenomena with diamond quantum microscopy
… of high-density memory devices based on novel magnetic materials has promising aspects such as un- matched data retention and low power consumption. However, this technology is still in its early stages and requires further development. Two-dimensional van der Waals magnets and antiferromagnets …
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Understanding nanomagnetism from all angles: Developments in magnetic electron tomography
… electron microscopy (TEM) techniques to study magnetic nanomaterials in three dimensions (3D). At the nanoscale, magnetic materials exhibit various intriguing behaviours such as topological protection in skyrmions (which may be used in next-generation computers), vortex states in nanorings …
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Statistics In Diffractive Imaging
… reconstruction techniques in diffractive imaging when the data is exceptionally noisy and when crucial experimental parameters are unmeasured. In particular, this work focuses on two applications of diffractive imaging, single particle imaging with unoriented data and ultrafast magnetic …
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Precision magnetometry and imaging via quantum manipulation of spins in diamond
… various concentrations toward high-performance magnetic field sensing and imaging. First, the wide-field optical magnetic microscopy experiment provides ensemble- NV control via continuous-wave electron spin resonance and camera-based parallel spin-state readout. This microscope offers a factor …
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Constructing and Characterizing a Scanning SQUID Microscope for a Cryogen Free Dilution Refrigerator
… devices, or SQUIDs, are highly sensitiveto magnetic flux and can be used to perform magnetic imaging at cryogenic tem- peratures. In this dissertation, I describe the first scanning SQUID microscope in a cryogen-free dilution refrigerator. First, I briefly describe basic SQUID theory, how to …
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Study of Spin Configuration of Hexagonal Shaped Ferromagnetic Structures
… study of spin configurations in hexagonal ferromagnetic structures. The characterisation system developed is able to perform in-situ magnetic imaging, structural modification and electrical transport measurement on ferromagnetic structures. For the latter, hexagonal ferromagnetic structures were …
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The Dissociation of Location and Object Working Memory Using Fmri and Meg
… the purpose of making immediate decisions. Neuroimaging experiments of VWM provide evidence in support of a neural system mainly involving a fronto-parietal neuronal network, but the role of specific brain areas is less clear. A proposal that has recently generated considerable debate suggests …
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Synthesis and Characterization of Novel Nanoparticles for Use as Photocatalytic Probes and Radiotracers
… the reaction. The nanocomposite materials were magnetic and exhibited optical properties similar to gold nanoparticles. Since we were not able to directly synthesize core shell gold magnetite nanoparticles, TiO2 was used as a bridging material. TiO2 nanoparticles with embedded magnetite were …
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Studying magnetic and 3D atomic structure using 4D scanning transmission electron microscopy
… offers more information than conventional imaging modes like annular dark field STEM, but the interpretation of electron diffraction patterns is often not straightforward. In this dissertation, I present 4D-STEM experiments for studying magnetic and 3D atomic structure, complemented with …
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Imaging Nanoscale Spin Textures with Scanning Diamond Quantum Microscopy
Magnetic materials play a key role in the advancement of modern technology, from data storage mediums and giant magnetoresistance read heads for information processing, to medical applications like drug delivery and magnetic resonance imaging. Their research and development have progressed towards …
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Explorations of domain walls and half quantum vortices in unconventional superconductors
… signatures of such currents, in the form of magnetic fields, have not been observed in Sr2RuO4, to date, despite considerable efforts. In this thesis, we explore alternative magnetic signatures of the existence of walls between domains of opposing chirality. We show that, in the limit in …