Finite Conductivity Effects in Electrostatic Force Microscopy on Thin Dielectric Films: A Theoretical Model
Joint Authors
Castellano-Hernández, E.
Sacha, G. M.
Source
Advances in Condensed Matter Physics
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-09-13
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
A study of the electrostatic force between an Electrostatic Force Microscope tip and a dielectric thin film with finite conductivity is presented.
By using the Thomas-Fermi approximation and the method of image charges, we calculate the electrostatic potential and force as a function of the thin film screening length, which is a magnitude related to the amount of free charge in the thin film and is defined as the maximum length that the electric field is able to penetrate in the sample.
We show the microscope’s signal on dielectric films can change significantly in the presence of a finite conductivity even in the limit of large screening lengths.
This is particularly relevant in determining the effective dielectric constant of thin films from Electrostatic Force Microscopy measurements.
According to our model, for example, a small conductivity can induce an error of more than two orders of magnitude in the determination of the dielectric constant of a material.
Finally, we suggest a method to discriminate between permittivity and conductivity effects by analyzing the dependence of the signal with the tip-sample distance.
American Psychological Association (APA)
Castellano-Hernández, E.& Sacha, G. M.. 2015. Finite Conductivity Effects in Electrostatic Force Microscopy on Thin Dielectric Films: A Theoretical Model. Advances in Condensed Matter Physics،Vol. 2015, no. 2015, pp.1-6.
https://search.emarefa.net/detail/BIM-1052308
Modern Language Association (MLA)
Castellano-Hernández, E.& Sacha, G. M.. Finite Conductivity Effects in Electrostatic Force Microscopy on Thin Dielectric Films: A Theoretical Model. Advances in Condensed Matter Physics No. 2015 (2015), pp.1-6.
https://search.emarefa.net/detail/BIM-1052308
American Medical Association (AMA)
Castellano-Hernández, E.& Sacha, G. M.. Finite Conductivity Effects in Electrostatic Force Microscopy on Thin Dielectric Films: A Theoretical Model. Advances in Condensed Matter Physics. 2015. Vol. 2015, no. 2015, pp.1-6.
https://search.emarefa.net/detail/BIM-1052308
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1052308