Fig. 4From: Fabrication of Nanoscale Pits with High Throughput on Polymer Thin Film Using AFM Tip-Based Dynamic Plowing LithographyDependence of groove depth on the scratching velocity in typical scratching directions: a V 1 and V 3, parallel to the long axis of the cantilever; b V 2 and V 4, perpendicular to the long axis of the cantilever. The insets show the cross-section of nanogrooves for scratching velocities of 0.5 and 50 μm/sBack to article page