Fluctuation in Two-Dimensional Stick-Slip Phenomenon Observed with Two-Dimensional Frictional Force Microscope.

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  • Fujisawa Satoru
    Department of Physics, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724
  • Kishi Eigo
    Department of Physics, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724
  • Sugawara Yasuhiro
    Department of Physics, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724
  • Morita Seizo
    Department of Physics, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724

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We used an atomic force microscope combined with a lateral force microscope (AFM/LFM) as a two-dimensional frictional force microscope (2D-FFM) to investigate the two-dimensional behavior of the atomic-scale friction between the cleaved surface of MoS2 and the Si3N4 tip apex of the microcantilever based on the two-dimensional stick-slip model. As a result, for the scan direction along the row of the stick-points, we found the unstable state where the tip apex shows fluctuation between two adjacent rows of stick-points. On the other hand, near the row of the stick-points, we also found the stable state where the tip apex takes a straight walk on a row of the stick-points without fluctuation.

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