University of Illinois Urbana-Champaign

Angle-resolved photoemission spectroscopy studies of epitaxially-grown van der Waals ferromagnets

Bowers, John Wilson

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https://hdl.handle.net/2142/117760

Description

Title
Angle-resolved photoemission spectroscopy studies of epitaxially-grown van der Waals ferromagnets
Author(s)
Bowers, John Wilson
Issue Date
2022-11-21
Director of Research (if dissertation) or Advisor (if thesis)
Chiang, Tai-Chang
Doctoral Committee Chair(s)
Eckstein, James N
Committee Member(s)
  • Stone, Michael
  • Kahn, Yonatan F
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • ARPES
  • MBE
  • 2D magnets
Abstract
Demand for faster, more-efficient electronic devices has driven research into materials with exotic magnetic and electronic properties. Ferromagnetic materials and their heterostructures are of special interest as potential components of ‘spintronic’ devices which manipulate electron spins to produce magnetic currents and fast computer memory. In this work, molecular-beam epitaxy (MBE) techniques are applied to grow CrI3 and CrGeTe3 (CGT), which host rare two-dimensional magnetic order. Thin film samples of various thicknesses, down to single monolayer (ML) as well as bulk regime thickness, were grown using various conditions on graphene and Bi2Te3 substrates. Angle resolved photoemission spectroscopy (ARPES) is applied to map the band structure of these films, confirming that insulating compounds were formed with a strong presence of the Cr 3d orbitals, which drive magnetic behavior, near the fermi level. This study suggests that MBE is a viable method for the production of 2D ferromagnetic vdW materials, and opens promising avenues of research into heterostructure studies, including the growth of ferromagnetic films in proximity with topological insulators.
Graduation Semester
2022-12
Type of Resource
Thesis
Copyright and License Information
2022 by John Wilson Bowers. All rights reserved.

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