Thermal pole-tip protrusion analysis of magnetic heads for hard disk drives

Decreasing the flying height caused by the high recording density of hard disk drives has greatly impacted HDI technology, and the flying heights can now be less than 10 nm. This paper introduces an accurate numerical model that takes ABS pressure distribution into consideration and obtains good agreement between the numerical and experimental results. A modeled head slider with a finite element mesh was performed. The magnetic head coil structure and MR sensors were modeled in detail to simulate coil heating. Then, highly accurate measurements were obtained for most of the material properties. Lastly, we compared the results with the experimental results from the read output differences and confirmed that accurate results could be obtained using detailed models, reliable material properties, and correct temperature distribution.