Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


HYu thesis complete v4.pdf (2.75 MB)

ETD Abstract Container

Abstract Header

Spin Dynamics in Novel Materials Systems

Yu, Howard
http://rave.ohiolink.edu/etdc/view?acc_num=osu1435582765

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Physics.
Spintronics and organic electronics are fields that have made considerable advances in recent years, both in fundamental research and in applications. Organic materials have a number of attractive properties that enable them to complement applications traditionally fulfilled by inorganic materials, while spintronics seeks to take advantage of the spin degree of freedom to produce new applications. My research is aimed at combining these two fields to develop organic materials for spintronics use. My thesis is divided into three primary projects centered around an organic-based semiconducting ferrimagnet, vanadium tetracyanoethylene. First, we investigated the transport characteristics of a hybrid organic-inorganic heterostructure. Semiconductors form the basis of the electronics industry, and there has been considerable effort put forward to develop organic semiconductors for applications like organic light-emitting diodes and organic thin film transistors. Working with hybrid organic-inorganic semiconductor device structures allows us to potentially take advantage of the infrastructure that has already been developed for silicon and other inorganic semiconductors. This could potentially pave the way for a new class of active hybrid devices with multifunctional behavior. Second, we investigated the magnetic resonance characteristics of V[TCNE]x, in multiple measurement schemes and exploring the effect of temperature, frequency, and chemical tuning. Recently, the spintronics community has shifted focus from static electrical spin injection to various dynamic processes, such as spin pumping and thermal effects. Spin pumping in particular is an intriguing way to generate pure spin currents via magnetic resonance that has attracted a high degree of interest, with the FMR linewidth being an important metric for spin injection. Furthermore, we can potentially use these measurements to probe the magnetic properties as we change the physical properties of the materials by chemically tuning the organic ligand. We are therefore interested in exploring the resonance properties of this materials system to lay the groundwork for future spin pumping applications. Third, we have made preliminary measurements of spin pumping in hybrid and all-organic bilayer structures. As mentioned above, FMR-driven spin pumping is method for generating pure spin currents with no associated charge motion. This can be detected in a number of ways, one of which is monitoring the FMR characteristics of two ferromagnets in close contact, where spins injected from one magnet into the other changes the linewidth. In conjunction with the magnetic resonance measurements, we have started to investigate the FMR properties of these bilayer systems.
Ezekiel Johnston-Halperin (Advisor)
Jay Gupta (Committee Member)
Nandini Trivedi (Committee Member)
Pierre Agostini (Committee Member)
Ahmet Selamet (Committee Member)
152 p.
Physics
Spintronics; magnetism; organic

Recommended Citations

Citations

  • Yu, H. (2015). Spin Dynamics in Novel Materials Systems [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1435582765

    APA Style (7th edition)

  • Yu, Howard. Spin Dynamics in Novel Materials Systems. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1435582765.

    MLA Style (8th edition)

  • Yu, Howard. "Spin Dynamics in Novel Materials Systems." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1435582765

    Chicago Manual of Style (17th edition)

osu1435582765
860
© 2015, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.