Molecular Dynamics Simulation of Contact Force Between Sample and AFM Tip

CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2010, Vol. 27 ›› Issue (1): 150-156.

Molecular Dynamics Simulation of Contact Force Between Sample and AFM Tip

School of Electro-mechanical Engineering, Xidian University, Xi'an 710071, China

Received:2008-09-02 Revised:2009-03-10 Online:2010-01-25 Published:2010-01-25
Supported by:
National Natural Science Foundation of China (10476019) and Xi'an Applied Materials Innovation Fund Application (XA-AM-200802)

Abstract

Abstract: Contact between tip of atomic force microscope(AFM) and tested sample surface is simulated using molecular dynamics (MD).Relationship between contact force and gap is analyzed.Surface pressure distribution is discussed.Phenomena of "jump-to-contact" and "neck-separation" are observed.Hysteresis between contact process and separate process is obtained.Relationship of surface distortion radius with contact force and gap is also discussed.Only atomic layer close to contact area affects the contact force.Surface atoms close to the contact are pressed and those far from the contact are pulled.

Key words: molecular dynamics, contact force, AFM

CLC Number:

O411.3

TIAN Wenchao, CHEN Guimin, LIU Huanling. Molecular Dynamics Simulation of Contact Force Between Sample and AFM Tip[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2010, 27(1): 150-156.

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Molecular Dynamics Simulation of Contact Force Between Sample and AFM Tip

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