Abstract:
Hexagonal boron nitride ( {h} BN) has recently been investigated as a promising grain boundary material (GBM) for the nanogranular structure of L10-FePt-based heat-assi...Show MoreMetadata
Abstract:
Hexagonal boron nitride ( {h} BN) has recently been investigated as a promising grain boundary material (GBM) for the nanogranular structure of L10-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 16 nm thick FePt- {h} BN film with well-isolated columnar grains of diameter 6.4 nm, grain aspect ratio 2.5, and decent magnetic properties ( {H} _{\mathbf {C\bot }} = 21.3 kOe and {H} _{\mathbf {C//}} = 5 kOe).
Published in: IEEE Transactions on Magnetics ( Volume: 59, Issue: 11, November 2023)