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

Yu Wang; Xiongfei Wei; Xianghua Liang; Shiyan Yin; Yanyang Zi; Kwok-Leung Tsui

doi:10.1109/TMAG.2015.2472635

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

Yu Wang^*, Xiongfei Wei, Xianghua Liang, Shiyan Yin, Yanyang Zi, Kwok-Leung Tsui

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

6 Citations (Scopus)

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.

Original language	English
Article number	7222449
Journal	IEEE Transactions on Magnetics
Volume	52
Issue number	1
DOIs	https://doi.org/10.1109/TMAG.2015.2472635
Publication status	Published - 1 Jan 2016

Research Keywords

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

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

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.",

keywords = "electric potential, Head-disk interface, in-situ measurement, slider dynamics, thermal asperity sensor",

author = "Yu Wang and Xiongfei Wei and Xianghua Liang and Shiyan Yin and Yanyang Zi and Kwok-Leung Tsui",

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T1 - An in Situ Measurement Method for Electric Potential at Head-Disk Interface Using a Thermal Asperity Sensor

AU - Wang, Yu

AU - Wei, Xiongfei

AU - Liang, Xianghua

AU - Yin, Shiyan

AU - Zi, Yanyang

AU - Tsui, Kwok-Leung

PY - 2016/1/1

Y1 - 2016/1/1

N2 - 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.

AB - 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.

KW - electric potential

KW - Head-disk interface

KW - in-situ measurement

KW - slider dynamics

KW - thermal asperity sensor

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U2 - 10.1109/TMAG.2015.2472635

DO - 10.1109/TMAG.2015.2472635

M3 - RGC 21 - Publication in refereed journal

SN - 0018-9464

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

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ER -

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

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