Electron, oxygen, and spin transport in complex oxide perovskites
Abstract/Contents
- Abstract
- The manipulation of the spin of charge carriers within solid-state materials has the potential to greatly reduce power consumption and increase computational speeds and information storage densities. The development of these spintronic devices requires development of new materials which can be used to efficiently generate, propagate, and detect spin currents. One promising class of materials to use are the complex oxide perovskites, which exhibit a rich variety of tunable electronic and magnetic properties and which can be interfaced and combined to create emergent interfacial phenomena. In this thesis, I will cover two efforts to develop materials for spintronics applications. The first part of this thesis focuses on the surprising discovery that the pulsed laser deposition process used to grow homoepitaxial thin films of oxygen-deficient SrTiO(3-x) can significantly change the properties of the underlying SrTiO3 substrate. In the search for a low-dimensional metal with high mobility and high spin-orbit coupling, I find that the plume dynamics and kinetics during thin film growth cause significant oxygen-reduction of and conductivity in the entire substrate, significantly faster than by other processes. This has significant implications for thin film growth of many different materials. In the second part of the thesis, I will focus on spin current generation via microwaves in a low-loss ferromagnetic metal, (La2/3Sr1/3)MnO3, and the transmission of spin angular momentum across an epitaxial interface with a non-magnetic, high spin-orbit coupled metal, CaRuO3. Using ferromagnetic resonance spectroscopy to both generate these spin currents as well as measure magnetic properties, I not only find evidence of efficient spin pumping across the interface, but also find that the orthorhombic CaRuO3 can affect the magnetic and electronic anisotropy in these heterostructures, likely due to structural effects. While complex oxides remain promising candidates for spintronics, the integration of different materials offers additional degrees of freedom which must be fully understood to engineer additional functionality
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2020; ©2020 |
| Publication date | 2020; 2020 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Balakrishnan, Purnima P |
|---|---|
| Degree supervisor | Suzuki, Yuri, (Applied physicist) |
| Thesis advisor | Suzuki, Yuri, (Applied physicist) |
| Thesis advisor | Goldhaber-Gordon, David, 1972- |
| Thesis advisor | Lee, Young Sang, 1971- |
| Degree committee member | Goldhaber-Gordon, David, 1972- |
| Degree committee member | Lee, Young Sang, 1971- |
| Associated with | Stanford University, Department of Physics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Purnima Parvathy Balakrishnan |
|---|---|
| Note | Submitted to the Department of Physics |
| Thesis | Thesis Ph.D. Stanford University 2020 |
| Location | electronic resource |
Access conditions
- Copyright
- © 2020 by Purnima P. Balakrishnan
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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