Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 72, Issue 2, Pages 1425-1434Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1342032
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Using numerical calculations based on a finite element method, we present a quantitative analysis of the dielectric constant of thin films on thick substrates in order to fit the experimental data measured by a scanning microwave microscope. The shift of the resonance frequency of the probe was calculated for the case of dielectric thin films on LaAlO3 (epsilon =24) and MgO (epsilon =10) substrates and, at the same time, the fitting functions were derived as a function of the tip-sample distance. The experimental data were found to agree well with our fitting functions, rendering our quantitative analysis reasonable. We have also discussed the effect of the anisotropy of dielectric constants. (C) 2001 American Institute of Physics.
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