Abstract
In order to avoid wear, the head-medium interface (HMI) is designed so that the magnetic head is separated from the media by a thin air film (Chapter 1). The air film on which the head flies must be thick enough to prevent excessive material interactions under all operating conditions; yet, it must be thin enough to give a sufficiently large recording signal. After startup, a full air bearing is developed above a certain sliding speed (known as takeoff speed). The air-film thickness profile is formed such that the resulting hydrodynamic air pressure balances the external loads applied at the interface. Intuitively, we can understand how it works by considering the boundary layer of the air that moves with the sliding surface. This layer gets compressed in the converging channel (present in all head-medium interfaces) of the air bearing so the hydrodynamic pressure develops and supports the load on an air cushion.
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