Title :
A Study of Fabrication Process for L10 FePt-Based HAMR Media
Author :
Jiang Feng Hu ; Cher, Kelvin M. ; Yi Yang ; Lay Geok Ng ; Hnin Yu Yu Ko ; Jian Zhong Shi ; Tie Jun Zhou
Author_Institution :
Data Storage Inst., Agency for Sci., Technol. & Res., Singapore, Singapore
Abstract :
The effect of the fabrication process on magnetic, textural, and microstructural properties of the L10 ordered FePt heat-assisted magnetic recording media with basic structure of NiTa/MgO/X/FePt-C/FePt-SiO2 was investigated. Compared with the one-step heating process, both postannealing and two-step heating processes enhanced the chemical ordering of FePt. The two-step heating sample demonstrated improved lateral grain isolation and smaller grain sizes. Results suggested that the higher deposition temperature could improve the phase separation of FePt and SiO2, thus improving the microstructure of FePt-based granular films. Diffusion of Ta from NiTa seedlayer into MgO underlayer was also observed causing the amorphization of the MgO near the NiTa/MgO interface.
Keywords :
carbon; disc drives; grain size; hard discs; heating; iron alloys; magnesium compounds; magnetic recording; nickel compounds; phase separation; platinum alloys; silicon compounds; L10 FePt-Based HAMR media fabrication process; NiTa-MgO-FePt-C-FePt-SiO2; amorphization; chemical ordering; deposition temperature; grain sizes; granular films; hard disk drives; heat-assisted magnetic recording media; lateral grain isolation; magnetic properties; microstructural properties; one-step heating process; phase separation; postannealing; seedlayer; textural properties; two-step heating processes; Coercive force; Grain size; Heat-assisted magnetic recording; Heating; Media; Microstructure; Heat-assisted magnetic recording (HAMR); L10 ordered FePt; microstructure; thermal treatment;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2321424
