抄録
Recording media with grooves such as discrete track media (DTM) and bit-patterned media (BPM), are considered to be some of the most promising media for achieving ultrahigh track densities. Thus, it is becoming increasingly important to analyze the static and dynamic characteristics of flying head sliders over DTM/BPM media using the molecular gas-film lubrication (MGL) equation. In this paper, we expand typical BPM disk configuration to Fourier series and first obtain time independent slider attitude and use the perturbation method in the frequency domain for dynamic responses to obtain not only the stiffness and damping produced by the air film but also the negative stiffness caused by the attractive van der Waals (vdW) force. The slider with 3 degrees-of-freedom (3-DOF) over an asymmetric groove-slider configuration has a rolling motion in addition to translational and pitching motions. The dependence of the dynamic characteristics such as spacing fluctuations on the groove depth and the frequency were numerically obtained.
