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Fabrication of 16nm-thick granular L10 FePt-hBN thin film media

Chengchao Xu,B. S. D. Ch. S. Varaprasad,David E. Laughlin,Jian-Gang Zhu

IEEE Transactions on Magnetics（2023）

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摘要
Hexagonal boron nitride ( h BN) has recently been investigated as a promising grain boundary material for the nanogranular structure of L1 0 -FePt based heat-assisted magnetic recording(HAMR) media. In this study, we systematically investigated FePt- h BN granular thin films (7.5 nm) with various h BN concentrations, to provide a fundamental understanding of the effect of introducing h BN nanosheets in the medium film on its microstructure and magnetic properties. Following the optimization of the h BN concentrations, we demonstrated a method to fabricate a thicker recording layer while maintaining the desired nanogranular microstructure. We successfully fabricated the 16nm-thick FePt- h BN film with well-isolated columnar grains of diameter 6.4nm, grain aspect ratio 2.5, and decent magnetic properties ( H C⊥ =21.3 kOe, H C// =5 kOe).
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fabrication,nm-thick
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