Abstract
An effect of novel path generation algorithms for focused ion beam (FIB) milling is characterized in this paper. The basic concept of the suggested paths is to distribute the directional artifacts induced by the ion beam in order to overcome or minimize the inevitable drawbacks of FIB milling. Path generation algorithms, inspired by conventional mechanical machining, were applied to the FIB scanning paths. Our results showed that the scanning path had a significant influence on the product quality with negligible time loss. Numerous paths could be generated using the suggested approach, and eight representative paths were selected for experimental characterization with regard to the surface morphology, sputter yield, and artifacts formation. Our results showed that the backstitch raster and balanced raster exhibited the best quality in terms of low roughness and high squareness of the pocket. Conventional raster and serpentine scans created a large degree of defects, due to the material redeposition and varying ion incidence angle; however, these types of scan provided a high sputter yield. The proper scanning path can be determined with respect to the required squareness, surface roughness, or productivity.
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