Investigation of the dynamic characteristics of light delivery for thermal assisted magnetic recording

Kyoung Su Park, Ki Hoon Kim, Young Pil Park, No Cheol Park

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Several new technologies have recently been proposed for high areal density greater than 5 Tb/in2 as next generation storage devices. Among these technologies is thermal assisted magnetic recording (TAMR). However, there are several dynamic and realistic problems associated with the current method of TAMR light delivery that must be resolved. In this paper, we investigate and discuss the dynamic characteristics for two kinds of light delivery systems using experimental and simulated results. We concluded that the optical fiber TAMR light delivery system had higher vertical and pitch stiffness. This could result in higher flying height modulation (FHM) on the disk surface and reduced TD-TO performance. Furthermore, since the optical fiber TAMR light delivery system has a lower positive pitch angle during unloading process, as soon as the air bearing disappears after the limiter is engaged, the contact possibility between the slider and the disk increases in unloading process. In addition, for the mounted laser diode (LD) TAMR light delivery system, we constructed a thermal-structural coupling finite element (FE) model of the entire TAMR system and simulated the thermal distribution and structural expansion according to temperature distribution. The results showed that the thermal problem was caused by heat produced by the LD, which can affect the head disk interface (HDI) problem in high areal density.

Original languageEnglish
Article number5929006
Pages (from-to)1992-1998
Number of pages7
JournalIEEE Transactions on Magnetics
Issue number7
Publication statusPublished - 2011 Jul

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0000769) and (No. 2009-0076065).

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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