University of Illinois Urbana-Champaign

The c33 elastic constant of MoS2 as a function of pressure and the deposition of multilayer thin films by sputtering

Li, May-Ling Marie

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https://hdl.handle.net/2142/90845

Description

Title
The c33 elastic constant of MoS2 as a function of pressure and the deposition of multilayer thin films by sputtering
Author(s)
Li, May-Ling Marie
Issue Date
2016-04-28
Director of Research (if dissertation) or Advisor (if thesis)
Cahill, David G.
Department of Study
Materials Science & Engineerng
Discipline
Materials Science & Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
  • MoS2
  • sputtering
  • cobalt
  • platinum
  • diamond anvil cell
  • elastic constants
  • brillouin scattering
Abstract
The c33 elastic constant of exfoliated MoS2 flakes was measured up to 11 GPa using a diamond anvil cell and picosecond interferometry. The resulting elastic constants were similar those predicted by hybrid density functional theory calculations by Peelaers and Van de Walle, but lower than those calculated from lattice constant measurements by Fan. However, due to the failure of the Lorentz-Lorenz relationship between index of refraction n and density, the change in n was not compensated for. This means that the actual c33constants are lower than those that have been reported here. A two source sputtering chamber for deposition of [Co,Pt] multilayer transducers for use in time-resolved magneto-optical Kerr effect (TR-MOKE) experiments is also discussed, along with the preliminary film and transducer characterization. Four-point probe measurements of the thin films indicated high resistivities corresponding to roughness or small grain size. A multilayer transducer was tested on a SiO2 reference wafer and had a dθ_K/dT of the same order of magnitude as similar [Co,Pt] transducers.
Graduation Semester
2016-05
Type of Resource
text
Permalink
http://hdl.handle.net/2142/90845
Copyright and License Information
Copyright 2016 May-Ling Li

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