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Exploring spin in novel materials and systems

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2011, Doctor of Philosophy, Ohio State University, Physics.
The field of spintronics has attracted tremendous attention from researchers because of its overwhelming advantages over the traditional electronic devices such as: higher speed, higher integration density, less power consumption, true nonvolatility, tunable optoelectronics, potentials for quantum information technology, etc. The metal based spintronics has brought huge success in the commercial market from the application of GMR effect, such as the hard drive read head and MRAM. However, coupling the spin degree of freedom to the semiconductor material gives more opportunities for new performance and functionality, due to its particular properties of the bandgap engineering, the easy control of the carrier concentrations and transport properties through doping, applying gate voltage and band offsets, as well as the potential in optoelectronic applications and the already existing overwhelming dominance of the semiconductor industry. There are active researches in all types of semiconductor materials for spintronics. However, recent work has focused on structures which rely on either metallic spin injectors that are not well suited to multifunctional operation or magnetic semiconductors that do not function under ambient conditions. This places significant limitations on the potential utility of devices based on these principles. To realize multifunctionality in spintronics, one part of my work is focused on using an organic-based room temperature magnetic semiconductor to enable multifunctional operation and fully functional semiconductor spintronic devices. The other approach to realize the multifuctionality is to develop a strong intrinsic multiferroic which could be potentially used in spintronics applications. By using magneto-optical kerr effect, the ferromagnetism is confirmed in the world’s strongest engineered multiferroic – strained EuTiO3 thin film. This is second part of my thesis work. Moreover, theory prediction points out that dimensionality of a system plays an important role in the mechanism of spin relaxation, for example, longer spin relaxation time is expected in quasi-1d structure. However, traditional optical probing of spin is not available in the 1d structure due to its polarization anisotropy. The third part of my work is controlling the polarization anisotropy of quasi-1d system through oxide coating it with media which has close dielectric constant. Consequently this approach promises optical pumping and probing spin dynamics in quasi-1d systems. Exploring spin in these novel materials and systems gives potential for new applications in spintronics field as well as realizes the desirable multifunctionalities.
Ezekiel Johnston-Halperin, PhD (Advisor)
Fengyuan Yang, PhD (Committee Member)
William Putikka, PhD (Committee Member)
Louis DiMauro, PhD (Committee Member)
Stuart Collins, PhD (Committee Member)
154 p.

Recommended Citations

Citations

  • Fang, L. (2011). Exploring spin in novel materials and systems [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299611695

    APA Style (7th edition)

  • Fang, Lei. Exploring spin in novel materials and systems. 2011. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1299611695.

    MLA Style (8th edition)

  • Fang, Lei. "Exploring spin in novel materials and systems." Doctoral dissertation, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299611695

    Chicago Manual of Style (17th edition)