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Scanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological Heterostructures
Scanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological Heterostructures
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153111
- ISBN
- 9798384460169
- DDC
- 530
- 저자명
- Goff, Bradley M.
- 서명/저자
- Scanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological Heterostructures
- 발행사항
- [Sl] : The Ohio State University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 268 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Gupta, Jay A.
- 학위논문주기
- Thesis (Ph.D.)--The Ohio State University, 2024.
- 초록/해제
- 요약Introducing magnetism to topological insulators can produce a variety of interesting macroscopic quantum phenomena and open new paradigms for energy-efficient and high-performance computing. This dissertation presents the first scanning tunneling microscopy study of a novel heterostructure consisting of the two-dimensional itinerant ferromagnet Fe3GeTe2 (FGT) and the topological insulator Bi2Te3. The electronic and topographic structure is characterized with atomic resolution, providing insights into the interface between magnetism and topology.I show that FGT rotationally aligns to the Bi2Te3 and both materials are unstrained with an electronic density of states identical to their bulk counterparts. Bi2Te3 is confirmed to retain its topological properties via quasiparticle inference imaging of the topological surface state. FGT is shown to retain its ferromagnetic properties down to the monolayer limit via MCD measurements.In addition, this dissertation details significant development towards a nanoscale magnetism measurement technique, FMR-STM. I demonstrate a reliable and efficient procedure to measure the transfer function to a sample with a strongly nonlinear I(V) curve. The transfer function is used to apply radio frequency (RF) excitations from 1 to 20 GHz with constant amplitude at the tunnel junction. I show a measurement of the thermoelastic expansion due to heating from the RF absorption associated with cable resonances. This is an important background signal for future FMR measurements. Additionally, I report the discovery of novel RF effects on field emission resonance (FER) states and demonstrate a proof-of-principle measurement of the relative transfer function utilizing the shift in FER energies.Lastly, I present software that I developed: MacroQueue. It provides a simple GUI to allow users to automate STM measurements throughout the entire parameter space without requiring coding. Currently, MacroQueue includes functions to control the 3 most common commercial STM systems - CreaTec, RHK, and Scienta Omicron - and can be extended to automate any system controllable via Python. This software is currently in active use in several laboratories at The Ohio State University and the NSF NeXUS Facility.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Physics
- 일반주제명
- Quantum physics
- 키워드
- 2D materials
- 기타저자
- The Ohio State University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211153111
■006m o d
■007cr#unu||||||||
■020 ▼a9798384460169
■035 ▼a(MiAaPQ)AAI31693664
■035 ▼a(MiAaPQ)OhioLINKosu1721235337826203
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aGoff, Bradley M.
■24510▼aScanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological Heterostructures
■260 ▼a[Sl]▼bThe Ohio State University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a268 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Gupta, Jay A.
■5021 ▼aThesis (Ph.D.)--The Ohio State University, 2024.
■520 ▼aIntroducing magnetism to topological insulators can produce a variety of interesting macroscopic quantum phenomena and open new paradigms for energy-efficient and high-performance computing. This dissertation presents the first scanning tunneling microscopy study of a novel heterostructure consisting of the two-dimensional itinerant ferromagnet Fe3GeTe2 (FGT) and the topological insulator Bi2Te3. The electronic and topographic structure is characterized with atomic resolution, providing insights into the interface between magnetism and topology.I show that FGT rotationally aligns to the Bi2Te3 and both materials are unstrained with an electronic density of states identical to their bulk counterparts. Bi2Te3 is confirmed to retain its topological properties via quasiparticle inference imaging of the topological surface state. FGT is shown to retain its ferromagnetic properties down to the monolayer limit via MCD measurements.In addition, this dissertation details significant development towards a nanoscale magnetism measurement technique, FMR-STM. I demonstrate a reliable and efficient procedure to measure the transfer function to a sample with a strongly nonlinear I(V) curve. The transfer function is used to apply radio frequency (RF) excitations from 1 to 20 GHz with constant amplitude at the tunnel junction. I show a measurement of the thermoelastic expansion due to heating from the RF absorption associated with cable resonances. This is an important background signal for future FMR measurements. Additionally, I report the discovery of novel RF effects on field emission resonance (FER) states and demonstrate a proof-of-principle measurement of the relative transfer function utilizing the shift in FER energies.Lastly, I present software that I developed: MacroQueue. It provides a simple GUI to allow users to automate STM measurements throughout the entire parameter space without requiring coding. Currently, MacroQueue includes functions to control the 3 most common commercial STM systems - CreaTec, RHK, and Scienta Omicron - and can be extended to automate any system controllable via Python. This software is currently in active use in several laboratories at The Ohio State University and the NSF NeXUS Facility.
■590 ▼aSchool code: 0168.
■650 4▼aCondensed matter physics
■650 4▼aPhysics
■650 4▼aQuantum physics
■653 ▼a2D materials
■653 ▼aMagnetic properties
■653 ▼aTopological heterostructures
■653 ▼aTopological insulators
■690 ▼a0611
■690 ▼a0599
■690 ▼a0605
■71020▼aThe Ohio State University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0168
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164989▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


