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Quantitative Phase Imaging of Magnetic Nanostructures Using Off-Axis Electron Holography

Abstract The research of this dissertation has involved the nanoscale quantitative characterization of patterned magnetic nanostructures and devices using off-axis electron holography and Lorentz microscopy. The investigation focused on different materials of interest, including monolayer Co nanorings, multilayer Co/Cu/Py (Permalloy, Ni81Fe19) spin-valve nanorings, and notched Py nanowires, which were fabricated via a standard electron-beam lithography (EBL) and lift-off process. Magnetization configurations and reversal processes of Co nanorings, with and without slots, were observed. Vortex-controlled switching behavior with stepped hysteresis loops was identified, with clearly defined onion states, vortex states, flux-closure (FC) states, and Ome... (more)
Created Date 2010
Contributor He, Kai (Author) / Mccartney, Martha R. (Advisor) / Smith, David J. (Advisor) / Chamberlin, Ralph V. (Committee member) / Crozier, Peter A. (Committee member) / Drucker, Jeff (Committee member) / Arizona State University (Publisher)
Subject Materials Science / Physics / Nanotechnology / Electron Holography / Lorentz Microscopy / Magnetic / Nanostructures / Quantitative Phase Imaging / Transmission Electron Microscopy
Type Doctoral Dissertation
Extent 148 pages
Language English
Reuse Permissions All Rights Reserved
Note Ph.D. Materials Science and Engineering 2010
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS

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Description Dissertation/Thesis