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Magnetic Resonance Detection Using Nitrogen-Vacancy Centers in Diamond
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Magnetic Resonance Detection Using Nitrogen-Vacancy Centers in Diamond. |
| 개인저자 | Purser, Carola Midori. |
| 단체저자명 | The Ohio State University. Physics. |
| 발행사항 | [S.l.]: The Ohio State University., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 158 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-06B. Dissertation Abstract International |
| ISBN | 9781392850978 |
| 학위논문주기 | Thesis (Ph.D.)--The Ohio State University, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-06, Section: B.
Advisor: Hammel, P. Chris. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | Magnetic resonance is a powerful method for chemical imaging and for understanding spin dynamics at the nanoscale. Techniques such as Magnetic Resonance Imaging (MRI) can be immediately appreciated for their application to non-invasive medical imaging. Sensitivity to shifts in nuclear spin resonances can be used to determine the local environment, which can then be used to determine the structure and dynamics of biomolecules. Magnetic resonance also finds relevance in information technology, whether to measure the properties of ferromagnetic materials or as a means to manipulate two-level systems for quantum information and quantum computing applications. In both paramagnetic and ferromagnetic applications, extending the spatial resolution will require greater sensitivity to few-spins, and broader application of magnetic resonance to a range of fields, temperatures, and materials will require novel approaches to sensing magnetic fields.In this work, the bright, spin-dependent fluorescence from negatively charged nitrogen-vacancy (NV) defects in diamond is used to measure magnetic resonance in both paramagnetic as well as ferromagnetic systems under various static field and drive conditions. The atomic-sized defect has atomic-like transitions, including an electronic ground state that can be optically excited to the electronic excited state as well as spin states that can be manipulated at microwave frequencies. The center can be optically initialized into the bright, ms = 0 ground state such that transitions to the more dimly fluorescing ms = 짹1 states can be detected via changes in the fluorescence intensity. The work featured in this dissertation detects magnetic resonance and magnetization dynamics by monitoring the NV fluorescence intensity. NV-based Non-Resonant Broadband (NV-NRB) detection is the featured technique here, which takes advantage of the sensitivity of NV centers to incoherent field noise at NV spin transitions. When a target spin resonance is driven with microwaves, indirect processes result in noise at NV transition frequencies that enhance the NV relaxation rates. The enhanced NV relaxation rates can then be measured in a continuous-wave fluorescence detection scheme or in a time-resolved measurement that monitors the fluorescence decay as a function of time. The off-resonance detection enables broadband detection such that the paramagnetic moment and ferromagnetic magnetization can be extracted from broadband detection. In each experiment, NV-NRB enables great flexibility. In the case of paramagnetic resonance spectroscopy, NV-based optical detection of target spin EPR can operate regardless of of the NV-bond axis to the external field. Because the orientation of the NV axis with respect to the external field determines the NV resonance and dispersion, many NV-based EPR techniques require static or well-aligned NV center orientations. In the case of ferromagnetic resonance, the sensitivity of NV centers to thermally excited spinwave noise enables measure of the magnetic properties without perturbing, or driving, the ferromagnet. In addition, the NV sensitivity to microwave as well as acoustic wave drive of ferromagnetic resonance enables local measure of the ferromagnet under diverse drive conditions. This dissertation therefore demonstrates the versatility of the NV center as a local, sensitive probe of magnetic resonance and magnetization dynamics. |
| 일반주제명 | Physics. Condensed matter physics. Nanoscience. |
| 언어 | 영어 |
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