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Local Magnetic Response and Vortex Dynamics in Thin Film Superconductors
Local Magnetic Response and Vortex Dynamics in Thin Film Superconductors
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104741
- ISBN
- 9798290652726
- DDC
- 530
- 서명/저자
- Local Magnetic Response and Vortex Dynamics in Thin Film Superconductors
- 발행사항
- [Sl] : Stanford University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 211 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Moler, Kathryn.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2024.
- 초록/해제
- 요약This thesis is based on five peer reviewed papers (Refs.corresponding to Chapters 2-6 respectively) plus more recent unpublished results (Chapter 7) and some ideas for new research directions (Chapter 8). Each chapter is self-contained and begins with a preface that includes the journal reference, author contributions, and a bit of context for how the project described in the chapter fits in to my overall graduate school experience at Stanford.Chapter 2 describes the construction, testing, and optimization of a new scanning SQUID microscope with a variable temperature sample stage in a cryostat cooled by a pulse tube cryo-cooler. This was the first major project I took part in at Stanford.Chapter 3 describes the development of, and demonstrates the use of, an open-source Python library for simulating the linear, quasi-static magnetic response of thin film superconducting structures with complicated geometries. The main motivation for this project was modeling the magnetic interaction between scanning SQUID sensors and magnetic or superconducting samples.Chapter 4 describes measurements and simulations of the magnetic response of disordered arrays of niobium nanoislands on gold thin films, which are an "engineerable" model system for inhomogeneous two-dimensional superconductivity. The measurements were performed before I got to Stanford, but I was heavily involved in the modeling and analysis used to interpret the measurement results. Limitations in our ability to model the magnetic response of these arrays motivated development of the numerical models described in Chapters 5 and 6, and the theme of proximity coupled Josephson junction arrays is explored further in Chapter 7.Chapter 5 describes the development of, and demonstrates the use of, an open-source Python library that solves a generalized time-dependent Ginzburg-Landau (TDGL) model for thin film superconductors of arbitrary geometry. This tool can model the nonlinear magnetic response and dynamics of multiply connected films, films with multiple current bias terminals, and films with a spatially inhomogeneous critical temperature.Chapter 6 ties together the simulation methods developed in Chapters 3 and 5 to develop a predictive model for the dynamics of vortices generated in a superconducting thin film by an AC SQUID susceptometry measurement, thereby answering some of the lingering questions from Chapter 4.Chapter 7 describes recent measurements of low temperature transport and superfluid phase stiffness in gate-tunable Josephson junction arrays consisting of micron-sized thin film superconducting islands deposited epitaxially onto a high mobility semiconductor two-dimensional electron gas. The goal of these measurements is to explore the breakdown of superconductivity at low temperature in a high quality materials system where relevant parameters such as the normal state conductivity, Josephson coupling, and strength of disorder can be tuned continuously in situ using an applied gate voltage.Finally, in Chapter 8 I suggest four possible research projects that follow naturally from the work presented in the previous chapters.
- 일반주제명
- Vortices
- 일반주제명
- Boundary conditions
- 일반주제명
- Thin films
- 일반주제명
- Materials science
- 키워드
- Superconductors
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2024 us c eng d■001000017358711
■00520260202104741
■006m o d
■007cr#unu||||||||
■020 ▼a9798290652726
■035 ▼a(MiAaPQ)AAI32149701
■035 ▼a(MiAaPQ)Stanfordpd014jf8282
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aHorn, Logan Bishop-Van.
■24510▼aLocal Magnetic Response and Vortex Dynamics in Thin Film Superconductors
■260 ▼a[Sl]▼bStanford University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a211 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Moler, Kathryn.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2024.
■520 ▼aThis thesis is based on five peer reviewed papers (Refs.corresponding to Chapters 2-6 respectively) plus more recent unpublished results (Chapter 7) and some ideas for new research directions (Chapter 8). Each chapter is self-contained and begins with a preface that includes the journal reference, author contributions, and a bit of context for how the project described in the chapter fits in to my overall graduate school experience at Stanford.Chapter 2 describes the construction, testing, and optimization of a new scanning SQUID microscope with a variable temperature sample stage in a cryostat cooled by a pulse tube cryo-cooler. This was the first major project I took part in at Stanford.Chapter 3 describes the development of, and demonstrates the use of, an open-source Python library for simulating the linear, quasi-static magnetic response of thin film superconducting structures with complicated geometries. The main motivation for this project was modeling the magnetic interaction between scanning SQUID sensors and magnetic or superconducting samples.Chapter 4 describes measurements and simulations of the magnetic response of disordered arrays of niobium nanoislands on gold thin films, which are an "engineerable" model system for inhomogeneous two-dimensional superconductivity. The measurements were performed before I got to Stanford, but I was heavily involved in the modeling and analysis used to interpret the measurement results. Limitations in our ability to model the magnetic response of these arrays motivated development of the numerical models described in Chapters 5 and 6, and the theme of proximity coupled Josephson junction arrays is explored further in Chapter 7.Chapter 5 describes the development of, and demonstrates the use of, an open-source Python library that solves a generalized time-dependent Ginzburg-Landau (TDGL) model for thin film superconductors of arbitrary geometry. This tool can model the nonlinear magnetic response and dynamics of multiply connected films, films with multiple current bias terminals, and films with a spatially inhomogeneous critical temperature.Chapter 6 ties together the simulation methods developed in Chapters 3 and 5 to develop a predictive model for the dynamics of vortices generated in a superconducting thin film by an AC SQUID susceptometry measurement, thereby answering some of the lingering questions from Chapter 4.Chapter 7 describes recent measurements of low temperature transport and superfluid phase stiffness in gate-tunable Josephson junction arrays consisting of micron-sized thin film superconducting islands deposited epitaxially onto a high mobility semiconductor two-dimensional electron gas. The goal of these measurements is to explore the breakdown of superconductivity at low temperature in a high quality materials system where relevant parameters such as the normal state conductivity, Josephson coupling, and strength of disorder can be tuned continuously in situ using an applied gate voltage.Finally, in Chapter 8 I suggest four possible research projects that follow naturally from the work presented in the previous chapters.
■590 ▼aSchool code: 0212.
■650 4▼aVortices
■650 4▼aBoundary conditions
■650 4▼aThin films
■650 4▼aMaterials science
■653 ▼aSuperconductors
■690 ▼a0794
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358711▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
