Abstract
In recent low flying height hard disk drives, the head write current causes thermal protrusion of the pole tip region that results in head–disk contact. Finite element analysis is performed in this work to study the temperature and displacement fields in heads during writing. Three-dimensional steady-state thermal-structural analysis of a head in air and over a disk is presented. Complex head geometry is modeled. Velocity slip and temperature jump boundary conditions are used in formulating heat transfer through the air bearing. Moreover, transient analysis of head thermal protrusion is presented. Step direct current is applied. Snapshots of the temperature field as well as temperature and displacement time functions of several locations in the head are exhibited. It is found that head protrusion first occurs at the pole tip, then spreads to the trailing end of the slider. For the head–disk interface studied, it takes 0.6 ms for the head to come in contact with the disk after writing starts.
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