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Atomic-scale dissipation processes in dynamic force spectroscopy

机译:动态力谱中的原子尺度耗散过程

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摘要

A systematic distance-dependent measurement of the quasistatic tip-sample interactions reveals a hidden stochastic dissipative interaction of the atomic-scale contact in dynamic force microscopy. By comparison of experiment with detailed molecular dynamics simulations, we demonstrate that the infrequently observed hysteresis loops are attributed to the formation of atomic chains during tip retraction. These lead to a large magnitude of energy dissipation in a single cycle and dominate the average measured dissipation, while also leading to differences in the forces measured in static and dynamic force microscopy. This paper provides quantitative force measurements and insights into atomic-scale dissipation processes.
机译:准静态尖端-样品相互作用的系统依赖于距离的测量揭示了在动态力显微镜下原子尺度接触的隐藏的随机耗散相互作用。通过将实验与详细的分子动力学模拟进行比较,我们证明了很少观察到的磁滞回线归因于尖端回缩过程中原子链的形成。这些导致单个循环中的大量能量耗散,并支配了平均测得的耗散,同时还导致了在静态和动态力显微镜下测得的力的差异。本文提供了定量的力测量和对原子尺度耗散过程的见解。

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  • 来源
    《Physical review》 |2011年第11期|p.990-998|共9页
  • 作者单位

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

    Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33010 Tampere, Finland,Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland;

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

    Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33010 Tampere, Finland,Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland;

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

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