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

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.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Materials Science & Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2016

Author dc:creator

• Li, May-Ling Marie

Contributors dc:contributor

• Cahill, David G.

• MoS2
• sputtering
• cobalt
• platinum
• diamond anvil cell
• elastic constants
• brillouin scattering

Statement dc:rights

• Copyright 2016 May-Ling Li

Language dc:language

en

Handle dc:identifier

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

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/90845