Thumbnail
Access Restriction
Open

Author Wood, Ryan M. ♦ Tokarski, John T. ♦ McCarthy, Lauren A. ♦ Bowers, Clifford R. ♦ Stanton, Christopher J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ BONDING ♦ BOWING ♦ COOLING ♦ EPOXIDES ♦ ETCHING ♦ FILMS ♦ GALLIUM 71 ♦ GALLIUM ARSENIDES ♦ INTERACTIONS ♦ LAYERS ♦ MONOCRYSTALS ♦ NUCLEAR MAGNETIC RESONANCE ♦ RELAXATION ♦ SILICON ♦ STRAINS ♦ STRESSES ♦ SURFACES ♦ TEMPERATURE RANGE 0273-0400 K ♦ THICKNESS
Abstract Elastic interactions in GaAs/Si bilayer composite structures were studied by optically pumped nuclear magnetic resonance (OPNMR). The composites were fabricated by epoxy bonding of a single crystal of GaAs to a single crystal of Si at 373 K followed by selective chemical etching of the GaAs at room temperature to obtain a series of samples with GaAs thickness varying from 37 μm to 635 μm, while the Si support thickness remained fixed at 650 μm. Upon cooling to below 10 K, a biaxial tensile stress developed in the GaAs film due to differential thermal contraction. The strain perpendicular to the plane of the bilayer and localized near the surface of the GaAs was deduced from the quadrupolar splitting of the Gallium-71 OPNMR resonance. Strain relaxation by bowing of the composite was observed to an extent that depended on the relative thickness of the GaAs and Si layers. The variation of the strain with GaAs layer thickness was found to be in good agreement with a general analytical model for the elastic relationships in composite media.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-28
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 120
Issue Number 8


Open content in new tab

   Open content in new tab