... and adhesion friction force near-contact recording Reducing the flying height (FH) of sliders is a requirement for achieving higher recording densities in hard disk drives (HDDs). The Wallace spacing loss equation indicates that the magnetic signal decreases exponentially as the distance increases...

... meniscus adhesion force friction force near-contact recording When the flying height of a slider is decreased to several nanometers over a smooth disk surface with small micro-waviness and roughness, the slider often exhibits a severe bouncing vibration whose fundamental frequency is close...