Head-stack assembly offtrack dynamics investigation via slider protrusion touch down

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

1 Scopus Citations
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Author(s)

  • Dapeng Zhao
  • Yu Wang
  • Xuechao Wang
  • Xiongfei Wei
  • Shengxiang Chen
  • And 1 others
  • Kwok-Leung Tsui

Detail(s)

Original languageEnglish
Article number6417003
Pages (from-to)703-706
Journal / PublicationIEEE Transactions on Magnetics
Volume49
Issue number2
Publication statusPublished - 2013

Abstract

To further increase the areal density to 2 rm TB/rm in2, the head-disk spacing needs to be reduced to sub 1 nm by using a thermal flying-height control technique that can adjust slider pole tip protrusion dynamically. At such low spacing, the slider pole tip protrusion-disk contact is inevitable. This contact will lead to slider vibration and head-stack assembly (HSA) going offtrack. This paper focuses on HSA offtrack dynamics induced by slider protrusion-disk contact, which was observed to have significantly different characteristics with traditional HSA dynamics excited by a voice-coil motor (VCM). With VCM excitation, the most dominant modes are from the entire HSA structure. However, with slider protrusion touch down (SPTD) excitation, head gimbal assembly (HGA) local modes are dominant. Both numerical analysis and experimental verification were used to explore the major factors influencing this characteristic. It is found that the gain of HGA sway is very sensitive to bending location when slider is excited by SPTD. Moreover, if the HGA local modes are close to HSA modes, they are easily coupled, which makes the offtrack vibration increase significantly. These findings can be used as references for optimizing the design of the HGA and HSA in order to improve the offtrack dynamics of HSA. © 1965-2012 IEEE.

Research Area(s)

  • Mode coupling, offtrack, slider protrusion, touch down

Citation Format(s)

Head-stack assembly offtrack dynamics investigation via slider protrusion touch down. / Zhao, Dapeng; Wang, Yu; Wang, Xuechao et al.
In: IEEE Transactions on Magnetics, Vol. 49, No. 2, 6417003, 2013, p. 703-706.

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