A study of FIB-patterned discrete track recording media by spinstand read/write testing and scanning probe microscopy

We have developed a new technique of quick fabrication and testing of discrete track recording (DTR) media for DTR concept and insight. DTR media by focused ion beam (FIB) patterning have been studied by spinstand read/write testing and scanning probe microscopy. DTR media show smaller magnetic track width and better signal separation between adjacent tracks and therefore higher track density than that of continuous media due to reduced side fringe effect and edge noise. It was also found that at a designed groove depth of 4-8 nm, the shallow FIB etched grooves already provide good isolation between adjacent tracks, indicating the importance of ion beam induced modification of magnetic properties in film media over physical modification of disk surface topography.