The effect of probe-tip geometry on force microscopy images
The atomic force microscope (AFM) has been used to characterize a variety of surfaces to study the influence of the instrumental parameters and sample topography on the interpretation of the images and the data obtained. The effect of the tip shape on the resulting image resolution and artifacts has been studied. Test samples of varied topography have been used to establish imaging parameter optimization for specific sample topographies.Chromium thin films of different thickness, deposited uniformly by rf diode sputtering, have been selected as test samples and imaged with a variety of tip shapes. These films were developed as underlayer films for magnetic recording media used in computer hard disks. The range of tips include commercial silicon nitride pyramidal tips, focused ion beam (FIB) sharpened silicon nitride pyramidal tips, and electron beam contamination induced tips (microtips) varying in growth time (i.e. length) from 10 to 40 seconds (approximately 0.40 to 0.65 μm).