MgO-C interlayer for grain size control in FePt-C media for heat assisted magnetic recording | Zendy

B. S. D. Ch. S. Varaprasad | Zendy; Bing Zhou | Zendy; Tong Mo | Zendy; David E. Laughlin | Zendy; Jian-Gang Zhu | Zendy

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MgO-C interlayer for grain size control in FePt-C media for heat assisted magnetic recording

Author(s) -

B. S. D. Ch. S. Varaprasad,

Bing Zhou,

Tong Mo,

David E. Laughlin,

Jian-Gang Zhu

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4973500

Subject(s) - heat assisted magnetic recording , grain size , materials science , coercivity , crystallite , layer (electronics) , recording media , perpendicular recording , deposition (geology) , composite material , condensed matter physics , metallurgy , perpendicular , multimedia , physics , transducer , mathematics , quantum mechanics , sediment , computer science , biology , paleontology , geometry

Currently, the most common recording media used for heat assisted magnetic recording is granular L10 based FePt-C directly deposited on a highly textured polycrystalline MgO underlayer. In this study, a thin granular MgO-C interlayer is inserted between the MgO underlayer and the granular L10-FePt-C magnetic layer to control the grain size of the magnetic media. By varying the deposition conditions of the MgO-C interlayer, we can vary the size of the L10-ordered FePt grains from about 10.5 nm to 7.6nm, while keeping the carbon composition in the magnetic layer unchanged. With the optimized interlayer, the L10-FePt-C media of grain size to 7.6 nm shows good squareness and perpendicular coercivity of 47 kOe as well as an order parameter of S = 0.85

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