Thermal effects on transducer material for heat assisted magnetic recording application

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Thermal effects on transducer material for heat assisted magnetic recording application
Title:
Thermal effects on transducer material for heat assisted magnetic recording application
Journal Title:
Journal of Applied Physics
Keywords:
Publication Date:
08 April 2015
Citation:
J. Appl. Phys. 117, 17A918 (2015)
Abstract:
Heat Assisted Magnetic Recording (HAMR) is a promising technology for next generation hard disk drives with significantly increased data recording capacities. In HAMR, an optical near-field transducer (NFT) is used to concentrate laser energy on a magnetic recording medium to fulfill the heat assist function. The key components of a NFT are transducer material, cladding material, and adhesion material between the cladding and the transducer materials. Since transducer materials and cladding materials have been widely reported, this paper focuses on the adhesion materials between the Au transducer and the Al2O3 cladding material. A comparative study for two kinds of adhesion material, Ta and Cr, has been conducted. We found that Ta provides better thermal stability to the whole transducer than Cr. This is because after thermal annealing, chromium forms oxide material at interfaces and chromium atoms diffuse remarkably into the Au layer and react with Au to form Au alloy. This study also provides insights on the selection of adhesion material for HAMR transducer.
License type:
PublisherCopyrights
Funding Info:
Description:
Copyright (2015) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 117, 17A918 (2015) and may be found at http://dx.doi.org/10.1063/1.4916807.
ISSN:
0021-8979
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