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Pump-probe thermoreflectance measurements of critical interfaces for thermal management of HAMR heads

Published online by Cambridge University Press:  25 July 2017

Gregory T. Hohensee*
Affiliation:
Western Digital Corporation, 1250 Reliance Way, Fremont CA94539, U.S.A.
Mousumi M. Biswas
Affiliation:
Western Digital Corporation, 1250 Reliance Way, Fremont CA94539, U.S.A.
Ella Pek
Affiliation:
Materials Science and Engineering, Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL61801, U.S.A.
Chris Lee
Affiliation:
Western Digital Corporation, 1250 Reliance Way, Fremont CA94539, U.S.A.
Min Zheng
Affiliation:
Western Digital Corporation, 1250 Reliance Way, Fremont CA94539, U.S.A.
Yingmin Wang
Affiliation:
Western Digital Corporation, 1250 Reliance Way, Fremont CA94539, U.S.A.
Chris Dames
Affiliation:
Mechanical Engineering, University of California Berkeley, Berkeley CA94720, U.S.A.
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Abstract

For heat-assisted magnetic recording (HAMR) heads, a major reliability limiter is the peak near-field transducer (NFT) temperature. Since the NFT is nanoscale, heat sinking is controlled by materials and interfaces within a few 100 nm of the NFT. Heat sinks can be metallic to take advantage of the 10x-100x higher thermal boundary conductance (TBC) of metal/metal interfaces, versus nonmetal interfaces. Oxide formation at these interfaces can greatly decrease the TBC and contribute to NFT failure. Likewise, the thermal resistance of material between the NFT and media recording layer greatly influences the NFT operating temperature. Here we use pump-probe thermoreflectance techniques (FDTR, TDTR) to study metal-metal interfaces and detect partial oxidation of a buried metallic thin film, as well as evaluate the interface thermal conductance of amorphous-amorphous interfaces in a film stack representative of a HAMR head-media interface.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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