Head protrusion measurement with TFC function under flying state

摘要

Effect of head protrusion is significantly becoming more important as reducing FH and introducing TFC, but there has been no direct measurement at flying state. As for current induced head protrusion, temperature distribution is difference between "Flying state" and "Static state". We need to measure of the protrusion under flying states. We will report direct head protrusion measurement methodology and results by conventional flying height tester (FHT). 3D protrusion map under flying state can be measured with trailing area including element and alumina over coat.