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Thesis
Development of a Unique Surface Magneto-Optical Kerr Effect Magnetometer to Correlate Magnetism and Structure in Fe-Fe₃O₄ Thin Film Bilayers
Master of Science (M.S.), Drexel University
Jul 2012
DOI:
https://doi.org/10.17918/etd-4121
Abstract
As the automotive industry moves steadily toward electric vehicles, there is an increasing need for more efficient electric motors. Currently, the state of the art in electric motor design is limited by silicon-steel laminations that restrict 3-dimensional flux-carrying capability. Oxide-coated ferrous powder metals offer the electrical resistivity and magnetic flux density needed for advanced electric motor design, but coating compatibility and performance are still the subject of much research. Here we have designed a unique magnetometer capable of characterizing this system in thin film form as well as future material systems. Additionally, we examine the microstructure and magnetic properties of Fe - Fe3O4, a promising system for this application. This study explores the structural compatibility between the core and coating material, as well as the magnetic hysteresis of the resulting composite, using a combination of electron microscopy and surface magneto-optical Kerr effect (SMOKE) magnetometry. We have designed a customized magnetometer with the ability to perform hysteresis measurements in a longitudinal geometry under magnetic fields up to 8 kOe with the option of adding modular improvements for in situ electric field application. This instrument allows for both static and dynamic measurements of thin film samples with high surface sensitivity. Structure-property relationships can be determined through this magnetic characterization and associated microstructural information provided by electron microscopy. The characterization of this system in thin film form will inform the eventual production of coated ferrous powders with improved electromagnetic properties.
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Details
- Title
- Development of a Unique Surface Magneto-Optical Kerr Effect Magnetometer to Correlate Magnetism and Structure in Fe-Fe₃O₄ Thin Film Bilayers
- Creators
- Ian Joseph McDonald - DU
- Contributors
- Mitra Taheri (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 4121; 991014632663504721