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中文摘要：
该文基于Derjaguin-Muller-Toporov接触模型，研究了振幅调制原子力显微镜（AM-AFM））成像中，3种典型针尖悬臂系统与四类具有不同力学性能的材料样品在针尖样品接近过程中互作用的响应情况。研究表明相位响应与针尖样品相互作用力作用形式密切相关。通过针尖的振幅曲线可确定针尖与样品间的互作用力的性质是吸引还是排斥，本研究结果有助于在AM—AFM成像实验中优化基准值设置，以避免对样品的损害。
英文摘要：
Based on the derjaguin-muller-toporov（DMT） contact model, the interaction response of three typical tip cantilever and four materials samples with different mechanical properties during the tip sample approaching were studied in the amplitude modulated atomic force microscopy（AM-AFM）. It has been shown that the tip-sample in- teraction force is strongly related to the phase of the first harmonic. Furthermore, we can easily determine the dis- tance in which the tip will affect the sample with attractive and repulsive interaction forces from the amplitude modu- lated approach curves,which is helpful for optimizing the setpoint in the scanning process of the amplitude-modula- tion atomic force microscopy（AM-AFM） imaging and avoiding the damage of the sample.
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