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Nanoscale thermal transport aspects of heat-assisted magnetic recording devices and materials

Published online by Cambridge University Press:  09 February 2018

James A. Bain ,
Jonathan A. Malen ,
Minyoung Jeong  and
Turga Ganapathy
James A. Bain
Affiliation:
Department of Electrical and Computer Engineering, Carnegie Mellon University, USA; jbain@cmu.edu
Jonathan A. Malen
Affiliation:
Department of Mechanical Engineering, Carnegie Mellon University, USA; jonmalen@cmu.edu
Minyoung Jeong
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, USA; minyounj@andrew.cmu.edu
Turga Ganapathy
Affiliation:
Department of Mechanical Engineering, Carnegie Mellon University, USA; tganapat@andrew.cmu.edu
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Abstract

Heat-assisted magnetic recording (HAMR) relies on careful management of heat flow at the nanoscale. This article describes the heat-transfer aspects of such a system that must be considered above and beyond standard Fourier’s Law-based heat conduction. A background on nanoscale heat transport is provided that discusses energy carriers and the role of interfaces and microstructure in nanoscale conduction. These heat-transport concepts are applied to the key components of the HAMR system—the head (principally, the near-field transducer [NFT]) and the magnetic medium. This analysis frames the central challenge of thermal engineering for a HAMR system—getting the medium hot enough while maintaining a NFT that it is cool enough to avoid degradation over time. Of particular note are discussions on the role of the interface thermal conductance in the NFT and the importance of thermal anisotropy in the medium due to its granular microstructure.

Keywords

thermal conductivitynanoscalemagnetic
Type
Materials for Heat-Assisted Magnetic Recording
Information
MRS Bulletin , Volume 43 , Issue 2: Materials for Heat-assisted Magnetic Recording , February 2018 , pp. 112 - 118
Copyright
Copyright © Materials Research Society 2018 

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