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Cantilever energy effects on bimodal AFM: Phase and amplitude contrast of multicomponent samples

机译：悬臂能量对双峰原子力显微镜的影响：多组分样品的相位和幅度对比

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Bimodal atomic force microscopy (AFM) is a recently developed technique of dynamic AFM where a higher eigenmode of the cantilever is simultaneously excited along with the fundamental eigenmode. The effects of different operating parameters while imaging an impact copolymer blend of polypropylene (PP) and ethylene-propylene (E-P) rubber in bimodal mode are explored through experiments and numerical simulations. The higher mode amplitude and phase contrasts between the two components of the sample reverse at different points as the free amplitude of the higher eigenmode is increased. Three different regimes are identified experimentally depending on the relative contrast between the PP and the E-P rubber. It is observed that the kinetic energy and free air drive input energy of the two cantilever eigenmodes play a role in determining the regimes of operation. Numerical simulations conducted with appropriate tip-sample interaction forces support the experimental results. An understanding of these regimes and the associated cantilever dynamics will guide a rational approach towards selecting appropriate operating parameters.
机译：双峰原子力显微镜（AFM）是动态AFM的最新开发技术，其中悬臂的较高本征模与基本本征模同时被激发。通过实验和数值模拟探索了在双峰模式下对聚丙烯（PP）和乙丙橡胶（E-P）的抗冲共聚物共混物进行成像时，不同操作参数的影响。随着较高本征模的自由振幅增加，样品的两个成分之间的较高模振幅和相位对比度在不同点处反转。根据PP和E-P橡胶之间的相对对比，实验确定了三种不同的处理方式。可以观察到，两个悬臂本征模式的动能和自由空气驱动输入能在确定运行状态中发挥作用。用适当的尖端-样品相互作用力进行的数值模拟支持实验结果。对这些状态和相关的悬臂动力学的理解将指导合理的方法来选择合适的操作参数。

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