Abstract
To achieve ultra-low flying height, magnetic spacing variations due to manufacturing tolerances and temperature-induced thermal protrusion need to be reduced. We have developed a thermal flying-height control (TFC) slider that carries a micro-thermal actuator. Previous TFCs were mainly statically controlled by a constant power supply. Our purpose is to demonstrate dynamic control of a TFC slider to compensate for high-speed magnetic signal modulation using feed-forward control methods, hi this report, to dynamically compensate for magnetic signal modulation using TFC, two methods were examined. Method 1 adjusted TFC power using only time domain information. Method 2 adjusted TFC power using frequency domain information in addition to time domain information. Method 2 showed better compensation for magnetic signal modulation due to better compensation at higher frequencies. These results showed that a dynamically controlled TFC is feasible in compensating for kHz order modulation.
