Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 58, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2021.3082920
Keywords
Media; Substrates; Glass; Grain boundaries; Grain size; Microstructure; Heat-assisted magnetic recording; Boron nitride (BN); FePt; X media; microstructure; segregant material
Funding
- Corning Research and Development Corporation
- Data Storage Systems Center at Carnegie Mellon University
- Kavcic-Moura Fund at Carnegie Mellon University
- [MCF-677785]
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In this study, FePt/FePt-BN/FePt-SiOx and FePt/FePt-C materials were fabricated for heat-assisted magnetic recording. The FePt/FePt-BN/FePt-SiOx media exhibited higher grain areal density and smaller grain-to-grain pitch distance, and could suppress the bimodal grain-size distribution. Both media showed good magnetic properties on Corning Lotus NXT glass substrates.
In this article, we present the fabrication of FePt/FePt-BN/FePt-SiOx and conventional FePt/FePt-C for heat-assisted magnetic recording (HAMR) on Corning Lotus NXT glass substrates. For FePt/FePt-BN/FePt-SiOx media, a 2.5 nm FePt/FePt-35vol.%BN was fabricated on polycrystalline MgO underlayers at 700 degrees C to serve as the templated layer for the growth of 4 nm FePt-35vol.%SiOx at 550 degrees C. For the FePt/FePt-C media, 6.5 nm FePt/FePt-C media was fabricated at 550 degrees C with FePt and C co-sputtered on top of 0.5 nm FePt. Both media show well-isolated FePt grains, which are fully surrounded by the grain boundaries materials. Compared with FePt/FePt-C media, the FePt/FePt-BN/FePt-SiOx media show distinctively smaller grain-to-grain pitch distance or higher grain areal density. Moreover, the bimodal grain-size distribution that is often observed in FePt/FePt-C media has been suppressed in the FePt/FePt-BN/FePt-SiOx media. In addition, both media show good magnetic properties on Corning Lotus NXT glass substrate.
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