An in Situ Measurement Method for Electric Potential at Head-Disk Interface Using a Thermal Asperity Sensor

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

  • Yu Wang
  • Xiongfei Wei
  • Xianghua Liang
  • Shiyan Yin
  • Yanyang Zi
  • And 1 others
  • Kwok-Leung Tsui

Detail(s)

Original languageEnglish
Article number7222449
Journal / PublicationIEEE Transactions on Magnetics
Volume52
Issue number1
Publication statusPublished - 1 Jan 2016

Abstract

The electrostatic force at head-disk interface (HDI) becomes increasingly significant when the head-disk clearance is dropping into 1 nm scheme. Therefore, detecting and eliminating the electric potential in the HDI is a critical task for hard disk drives. To that end, this paper proposed an in situ measurement method for electric potential at HDI using a thermal asperity (TA) sensor. When calibrating the electric potential, both dc and ac components of the external voltage were supplied to the disk. As a result, the output of the TA sensor to the first harmonic of the ac component was linearly increasing with the decrease in the dc components. Experimental results show that this method is more efficient and flexible than the traditional methods.

Research Area(s)

  • electric potential, Head-disk interface, in-situ measurement, slider dynamics, thermal asperity sensor

Citation Format(s)

An in Situ Measurement Method for Electric Potential at Head-Disk Interface Using a Thermal Asperity Sensor. / Wang, Yu; Wei, Xiongfei; Liang, Xianghua et al.
In: IEEE Transactions on Magnetics, Vol. 52, No. 1, 7222449, 01.01.2016.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review