NDLI: Thermal asperity suppression in perpendicular recording channels

Content Provider	IEEE Xplore Digital Library
Author	Mathew, G. Tjhia, I.
Copyright Year	2005
Description	Author affiliation: Electr. & Comput. Eng, Nat. Univ. of Singapore, Singapore (Mathew, G.; Tjhia, I.)
Abstract	In this paper, we present an approach for detection and suppression of thermal asperity (TA) induced signal distortions in perpendicular recording channels. When the MR read head comes in contact with the disk surface, the resulting thermal transient causes a change in the resistance of the MR read element. This change in the resistance manifests as an additive voltage transient in the readback signal. Typically, a TA signal has a short rise time (60-150 ns) with a longer decay time (1-5 /spl mu/s). The peak TA amplitude can be as large as 250%. If precautions are not taken, such transients could cause sector read failure. As the flying height continues to decrease and as the recording density continues to increase, the adverse effects of TA will become even more serious in future drives. Thus, it is particularly important to develop means to handle TA effectively in perpendicular recording channels. The study shows that the proposed method is robust with respect to the changes of the peak TA amplitude and to the mismatch between estimated and actual TA durations. Thus, in conclusion, we have developed an easily implementable and effective TA detection and mitigation approach for perpendicular recording channels.
Sponsorship	Magnetics Soc. of Japan Magnetics Soc. of the IEEE
Starting Page	113
Ending Page	114
File Size	215720
Page Count	2
File Format	PDF
ISBN	0780390091
DOI	10.1109/INTMAG.2005.1463485
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Perpendicular magnetic recording Surface resistance Thermal resistance Distortion Magnetic heads Contact resistance Voltage Robustness Amplitude estimation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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