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    Hybrid finite-element method-molecular dynamics approach for modelling of non-contact atomic force microscopy imaging

    , Article Micro and Nano Letters ; Volume 6, Issue 6 , June , 2011 , Pages 412-416 ; 17500443 (ISSN) Pishkenari, H. N ; Mahboobi, S. H ; Meghdari, A ; Sharif University of Technology
    Models capable of accurate simulation of the microcantilever dynamics coupled with complex tip-sample interactions are essential for interpretation of the imaging results in non-contact atomic force microscopy (AFM). In the present research, a combination of finite element and molecular dynamics methods are used for modelling the AFM system to overcome the drawbacks of conventional approaches that use a lumped system with van der Waals interaction. To illustrate the ability of the proposed scheme in providing images with atomic resolution, some simulations have been performed. In the conducted simulations, a diamond tip is interacting with nickel samples having different surface plane... 

    Investigation of the atomic-scale hysteresis in NC-AFM using atomistic dynamics

    , Article Physica E: Low-Dimensional Systems and Nanostructures ; Volume 42, Issue 8 , 2010 , Pages 2069-2077 ; 13869477 (ISSN) Nejat Pishkenari, H ; Meghdari, A ; Sharif University of Technology
    In this paper, the hysteresis in the tipsample interaction force in noncontact force microscopy (NC-AFM) is measured with the aid of atomistic dynamics simulations. The observed hysteresis in the interaction force and displacement of the system atoms leads to the loss of energy during imaging of the sample surface. Using molecular dynamics simulations it is shown that the mechanism of the energy dissipation occurs due to bistabilities caused by atomic jumps of the surface and tip atoms in the contact region. The conducted simulations demonstrate that when a gold coated nano-probe is brought close to the Au(0 0 1) surface, the tip apex atom jumps to the surface, and instantaneously, four...