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Scanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological Heterostructures
Scanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological He...
Scanning Tunneling Microscopy Characterization of Two-Dimensional Magnetic, Topological Heterostructures

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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
키워드  
Magnetic properties
키워드  
Topological heterostructures
키워드  
Topological insulators
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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■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.

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