Head disk interface charge and its potentlal applications

The head-disk spacing change has been achieved by applying a low voltage (<5 volts) of DC/AC charge at the head-disk interface. The flying height (FH) cbange was confirmed by both acoustic emission measurements and parametric measurements (amplitude, PW50, SNR). Potential applications of this technique include active slider that control flying height of the head at data and landing zones to meet different requirements, and accelerated head-disk tribology testers with controlled constant low flying height (with DC charge) or intennittent contacts (AC charge).