Improved gap servo system using a brake pulse for a SIL-based near-field recording system

Jung Gon Kim, Min Seok Kang, Won Ho Shin, No Cheol Park, Hyun Seok Yang, Young Pil Park, Jinkyung Lee, Ansik Jeong, Jonghyun Shin, Kyunggeun Lee

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A mode-switching servo is widely used in solid immersion lens (SIL)-based near-field recording (NFR) systems to control the air gap between the bottom surface of the SIL and the top surface of the rotating media. In the mode-switching servo, it is very important to reduce the initial overshoot in the near field region, as this overshoot can cause collisions between the SIL and the media, and increase the settling time required for the SIL to be initially moved to the final air gap. In this paper, the mode-switching servo with a brake pulse is proposed to reduce the initial overshoot and settling time. The effectiveness of the proposed method is proved by experiments of which results show that the minimum air gap due to the initial overshoot is improved from 6.86 to 18.73 nm and the settling time is reduced from 30 to 4.5 ms.

Original languageEnglish
Pages (from-to)309-315
Number of pages7
JournalMicrosystem Technologies
Issue number1-2
Publication statusPublished - 2010 Jan

Bibliographical note

Funding Information:
This work was funded by the Korea Science and Engineering Foundation (KOSEF) through the Center for Information Storage Mechatronics (CISM) Grant No. R17-2008-040-01001-0. We would like to acknowledge that Samsung Corporations have kindly provided us with technical supports on our experiments.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering


Dive into the research topics of 'Improved gap servo system using a brake pulse for a SIL-based near-field recording system'. Together they form a unique fingerprint.

Cite this