Effect of humidity on the nanoscale heat transfer at the head-media interface

Qilong Cheng, Yuan Ma, David Bogy

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

In hard disk drives (HDD), the head-media spacing has decreased to less than 10 nm. Across this nanoscale gap, the heat transfer between the head and media may affect the airbearing design, lubricant transfer and contact issues. Thus, understanding the heat transfer mechanism is very important to magnetic recording, especially for Heat Assisted Magnetic Recording (HAMR). In this paper, the heat transfer between a head and a static media is studied. In particular, the effect of humidity on the nanoscale heat transfer between a head and a static media is studied experimentally. From the transient and steady data of the experiments, it is proposed that the dynamic response of head protrusion is faster than heat dissipation. Also, a layer of water is assumed to form between the head and the media under high humidity. The water-layer affects the spacing and the heat transfer coefficient across the interface. In the near-contact regime, namely when the clearance is less than 2 nm or so, the protrusion interacts with the water-layer on the media, resulting in a lower rate of change of cooling.

Original languageEnglish
Title of host publicationASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791859124
DOIs
Publication statusPublished - 2019
Externally publishedYes
EventASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019 - San Diego, United States
Duration: 27 Jun 201928 Jun 2019

Publication series

NameASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019

Conference

ConferenceASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
Country/TerritoryUnited States
CitySan Diego
Period27/06/1928/06/19

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Information Systems
  • Hardware and Architecture

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