Dynamic Analysis Schemes for Flying Head Sliders Over Discrete Track Media

It is becoming increasingly important to analyze the static and dynamic characteristics of flying head sliders over discrete track media (DTM) and bit patterned media (BPM) using the molecular gas-film lubrication (MGL) equation. In this study, we obtained the dynamic characteristics of the air bearing of the read/write head by considering not only the stiffness and damping produced by the air film, but also the negative stiffness caused by the attractive van der Waals force; these quantities were calculated in the frequency domain using a perturbation method. The dependence of the dynamic characteristics on the groove depth and frequency were calculated numerically. Moreover, the cubic interpolated propagation (CIP) method, a highly accurate and numerically stable scheme, was extended to the two-dimensional MGL problem in the time domain and the time evolution of the pressure produced by a single projection on the running disk, which is the simplest configuration of BPM, was calculated numerically.