자료유형  

 학위논문

Control Number  

0017164989

International Standard Book Number  

9798384460169

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Goff, Bradley M.

Publication, Distribution, etc. (Imprint  

[S.l.] : The Ohio State University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

268 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

General Note  

Advisor: Gupta, Jay A.

Dissertation Note  

Thesis (Ph.D.)--The Ohio State University, 2024.

Summary, Etc.  

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.

Subject Added Entry-Topical Term  

Condensed matter physics.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Quantum physics.

Index Term-Uncontrolled  

2D materials

Index Term-Uncontrolled  

Magnetic properties

Index Term-Uncontrolled  

Topological heterostructures

Index Term-Uncontrolled  

Topological insulators

Added Entry-Corporate Name  

The Ohio State University Physics

Host Item Entry  

Dissertations Abstracts International. 86-04B.

Electronic Location and Access  

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Control Number  

joongbu:655495