Pokropivny A. Computer simulation of surface images and contact interactions in atomic-force microscopy

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0403U001378

Thesis Registration Form

0403U001378.pdf

Applicant for

Specialization

  • 01.04.07 - Фізика твердого тіла

09-04-2003

Specialized Academic Board

Д 26.207.01

Institute for Problems in Materials Science

Essay

The dissertation is devoted to theoretical investigations of contact interaction in AFM. The tip apex motion is studied with the help of molecular-dynamics imitation. The whole of cantilever motion is studied with the help of catastrophe theory. Method for construction of surface images with defects in AFM in constant force and constant height modes are devised. Influence of tip radius and modes on the resolving power and image contrast are studied. Deformation mechanisms of tip apex are investigated. Critical height of approach and critical force of scanning are determined. "Cantilever holder-cantilever-tip-surface" microsystem is proposed to consider as adhesional and frictional catastrophe machines. “Jump to contact” and “stick-slip” phenomena are investigated in details. The tip jumps as well as the adhesion and friction force variations are calculated. The causes of unstable motion are educed. Criteria of slipless, single-slip and multislip motions are established. Wearless and catastropheless modes of scanning are proposed for eliminate of the tip destruction.

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