Stress Distributions on the Slider with Different Accommodation Coefficients

Recently the influence of accommodation coefficient, which determines the behaviors of the reflected molecules at the boundary walls, was studied a lot for exploring the flying characteristics of head-disk interface. However, all of the researches are based on the slider with unique accommodation coefficient. In this paper, the different correction models of Reynolds equation, the free molecular gas film lubrication (MGL) equation and direct simulation Monte Carlo (DSMC) method are compared. Stress distributions on the slider with different accommodation coefficients were calculated by using the free molecular MGL equation and DSMC method respectively. The results show that the shear stress is different with the slider with different accommodation coefficients, and hence the shear stress can be controlled by giving the slider proper accommodation coefficients, without influencing the pressure. This provides a theory basis for the design of slider of HDD with high stability.