Viscous shear stress reduction by a second layer of slippage liquid for contact recording

In this paper we theoretically study a new concept of reducing the shear stress at the slider/disk interface for contact recording design by a second layer of liquid sandwiched between the slider and the PFPE lubricant. Our results show that a very thin layer of liquid with a much lower viscosity than that of PFPE is able to reduce the shear stress by a few orders of magnitude. Slight slippage of the second liquid at the slider surface further reduces the shear stress by a few times.