Nano-Scale Defect Mapping on a Magnetic Disk Surface Using a Contact Sensor

作者：Shimizu Yuki^*; Xu Junguo; Kohira Hidekazu; Kurita Masayuki; Shiramatsu Toshiya; Furukawa Masaru

来源：IEEE Transactions on Magnetics, 2011, 47(10): 3426-3432.

DOI：10.1109/TMAG.2011.2144961

• Contact sensor
• hard-disk drive
• head-disk interface
• tribology

Targeting both higher touchdown sensitivity and highly accurate nanometer-scale defect detection on a disk surface, a thermal-contact sensor, integrated into a magnetic-head slider, was developed. It was experimentally shown that the contact sensor has sensitivity for detecting head-disk contact at each radial position on a disk surface equivalent to that of a conventional acoustic-emission (AE) sensor. It was also shown that a defect-detection method using the thermal-contact sensor is feasible. Defect mapping, in which a slider inspecting the disk at a certain clearance detects small defects on the disk surface, done with this method was better sensitive with measurements with an optical surface analyzer (OSA). Defect mapping on a proto-type glide tester, based on a conventional glide tester, using the thermal-contact sensor was also demonstrated.

• 出版日期2011-10