R&D: FePt–BN Granular HAMR Media with High Grain Aspect Ratio and High L10 Ordering on Corning Lotus NXT Glass

AIP Advances has published an article written by B. S. D. Ch. S. Varaprasad, Chengchao Xu, Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA, and Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA, Ming-Huang Huang, Corning Research and Development Corporation, Corning, New York 14831-0001, USA, David E. Laughlin, and Jian-Gang Zhu, Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA, and Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA, and Materials Science and Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.

Abstract: “Fabricating highly ordered tall L1₀–FePt with a small grain pitch distance on a commercially available glass substrate is crucial to realize heat-assisted magnetic recording (HAMR) media for industrial manufacture. We have realized tall FePt grains surrounded by crystalized h–BN on Corning NXT glass deposited at elevated temperatures in the presence of radio frequency (RF) bias. In this paper, we discuss the effect of deposition temperature on the order parameter of L1₀–FePt–BN granular media. Well-isolated L1₀–FePt–BN granular media with a grain diameter of 6.5nm and height of 11nm is achieved. These films exhibit a high order parameter of 0.85 with a perpendicular coercivity of 35 kOe.“