R&D: HAMR’s Extensibility to High Linear and Areal Density
Grain-size media allows linear recording densities of up to 4,000 kbpi, and areal densities in 3-4Tb per square inch range can be extrapolated based on geometrical scaling.
This is a Press Release edited by StorageNewsletter.com on September 4, 2018 at 2:11 pmIEEE Transactions on Magnetics (Volume: PP, Issue: 99) has published an article written by Yukiko Kubota, Yingguo Peng, Yinfeng Ding, Eric K. C. Chang, Li Gao, Florin Zavaliche, Timothy J. Klemmer, Sha Zhu, Xiaobin Zhu, Pin-Wei Huang, Alexander Q. Wu, Hassib Amini, Seagate Technology, Fremont, CA 94538 USA, Steven Granz, Tim Rausch, Seagate Technology, Bloomington, MN 55435 USA, Chris J. Rea, Jiaoming Qiu, Huaqing Yin, Mike A. Seigler, Yonghua Chen, Seagate Technology, Shakopee, MN 55379 USA, Ganping Ju, and Jan-Ulrich Thiele, Seagate Technology, Fremont, CA 94538 USA.
Abstract: “Heat-assisted magnetic recording (HAMR) is being developed as the next generation magnetic recording technology. Critical components of this technology, such as the plasmonic near-field transducer and high anisotropy granular FePt media, as well as recording demonstrations and fully integrated drives have been reported. One of the remaining ongoing challenges of magnetic recording in general and HAMR in particular has been the demonstration of high linear density recording, approaching the grain-size (GS) limit of the recording media, and a clear pathway to smaller GSs while maintaining good magnetic properties and distributions. This paper will demonstrate the extensibility of FePt-based media down to the 5 nm center-to-center range. A linear recording density of 3000 kilobits per inch (kbpi), or a bit length of 8.5 nm, approaching the GS limit of this media, has been demonstrated on recording media with a slightly larger GS of 7 nm center-to-center, and using an HAMR head with high thermal gradient >10 K/nm. Key parameters of the media include the microstructure, the thermal design and magnetic properties, most importantly the tradeoff between achievable GS, media moment-thickness product, Mrt, and the distributions of the magnetic switching field and the Curie temperature. Further optimizing the composition, growth, and architecture of the media stack to achieve all the prerequisite magnetic and thermal properties for high signal-to-noise ratios in the smallest demonstrated GS media allows linear recording densities of up to 4000 kbpi, and areal densities in the 3-4 tera-bits-per-square-inch range can be extrapolated based on geometrical scaling.“
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