Numerical and experimental investigation of nanoscale heat transfer in the head-media interface during static touchdown

Siddhesh V. Sakhalkar, Qilong Cheng, Yuan Ma, Amin Ghafari, David B. Bogy

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

Abstract

With minimum fly height of less than 10 nm in contemporary hard-disk drives, understanding nanoscale heat transfer at the head-media interface is crucial for developing reliable head and media designs. Particularly, with the emergence of Heat-Assisted Magnetic Recording (HAMR) and Microwave-Assisted Magnetic Recording (MAMR), head failure due to overheating has become an increasing concern. There is a need to develop a methodology to use theoretical curves for spacing-dependent nanoscale heat transfer coefficient to predict head and media temperatures in actual hard disk drives. In this study, we present a numerical model to simulate the head and media temperature profiles during static touchdown and compare our results with experiments performed with a magnetic head on a silicon wafer. As the head approaches touchdown with increasing TFC power, the phonon conduction heat transfer coefficient between the head and the substrate increases exponentially, causing a drop in the head temperature vs TFC power curve. Our model shows that the introduction of van der Waals forces between the head and the substrate causes a steeper drop in the head temperature curve and ensures a good quantitative match with experimental results.

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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