浮上ヘッドスライダの剛性・減衰特性

抄録

The slider/disk spacing of magnetic disk drives has been reduced to the near contact phase where the slider/disk contact frequently occurs. Thus, the dynamic performance of slider is important to suppress the vibration caused by the contact. We have introduced a dynamic analysis method for air-bearing slider^[2][3], where the modal parameters, such as modal frequencies and modal damping ratios, are calculated. We investigated and evaluated the slider dynamic performance by using the method, and clarified that the damping characteristics is improved by providing recesses on the air bearing surface. The damping characteristics depends on the depth of recess, and the optimum depth, which maximizes the damping, exists. The damping characteristics also depends on the positional relation between the recess and the nodal line of slider vibration. The recess must be placed far from the nodal line to suppress the vibration by making the recess function efficient. The stiffness and damping distribution on the slider and the wave form of generated force caused by the slider vibration were calculated, and the mechanism of damping generation was examined.