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Development of MOKE Spectrometer for Magneto-optical Studies of Novel Magnetic Materials and Quantum Structures

Tanaka, Hiroki
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1226965026

Abstract Details

2008, Master of Science (MS), Ohio University, Electrical Engineering (Engineering and Technology).
The progress in modern, widely-defined information technology strongly depends on the ability of precise characterization of variety of materials in the wide range of anticipated parameters. Novel magnetic materials and magnetic structures are the core of the spintronics in which a manipulation of electrons spins opens a door to new concepts of practical applications. The magneto-optic is an interesting approach to effectively assess properties of spintronic materials due to the strong interaction of photons with spins mediated through spin-orbit coupling. This is manifested by observation of Faraday, Voigt and Kerr effects in magnetic materials. These effects crucially depend on the spin-orbit interactions in the starting and/or the ending state of the optical transition considered. In this work we exclusively focused on the magneto-optical Kerr effect through the development of and testing of the automated Magneto-Optical Kerr Effect (MOKE) spectrometer operating in polar and longitudinal geometries at room temperature. The constructed MOKE system has proven to be central to perform magneto-optical and magnetic characterizations of selected test and research samples. In particular, we were able to confirm the functionality of the MOKE by measuring Kerr rotation hysteresis loops of the Pt/Co superlattice test samples. Furthermore, a set of new results was obtained for the different epitaxially grown GaN/Fe material systems. The observed Kerr rotation signal for GaN/Fe was interpreted as the clear evidence for a strong spin-orbit interaction occurring in these novel magnetic materials. In addition to the conducted experimental work, special attention was dedicated to derive an analytically comprehensive description of the Kerr rotation and Kerr ellipticity in the general case of polar and longitudinal geometries. Finally, relying on the expertise gained during the MOKE spectrometer construction and testing, we proposed to upgrade the system necessary to improve its reliability and expand the scope of available magneto-optical measurement techniques at Ohio University.
Wojciech M. Jadwisienczak, PhD (Advisor)
97 p.
Electrical Engineering
MOKE; polar; Longitudinal; Kerr rotation; Kerr ellipticity; Co; Pt; Fe; GaN; LabVIEW; Setup; calibration; Lorentz; Magneto optical Kerr effect

Recommended Citations

Citations

  • Tanaka, H. (2008). Development of MOKE Spectrometer for Magneto-optical Studies of Novel Magnetic Materials and Quantum Structures [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1226965026

    APA Style (7th edition)

  • Tanaka, Hiroki. Development of MOKE Spectrometer for Magneto-optical Studies of Novel Magnetic Materials and Quantum Structures. 2008. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1226965026.

    MLA Style (8th edition)

  • Tanaka, Hiroki. "Development of MOKE Spectrometer for Magneto-optical Studies of Novel Magnetic Materials and Quantum Structures." Master's thesis, Ohio University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1226965026

    Chicago Manual of Style (17th edition)

ohiou1226965026
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© 2008, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.