High-Density Shingled Heat-Assisted Recording Using Bit-Patterned Media Subject to Track Misregistration

• Published in: IEEE transactions on magnetics Vol. 53; no. 11; pp. 1 - 4
• Main Authors: Venugopal, Aneesh, Ghoreyeshi, Ali, Victora, R. H.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bit-patterned media (BPM); composite media; Composite structures; Curie temperature; Density; Ferrous alloys; heat-assisted magnetic recording (HAMR); Heating systems; Intermetallic compounds; Iron compounds; Magnetic heads; Magnetic recording; Magnetic tape; Magnetism; Mathematical model; Media; Platinum compounds; shingled recording; Switches; Switching; switching distribution; Tracking; Vibration; Writing
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2017.2695802

Shingled recording employing bit-patterned media when used in conjunction with heat-assisted magnetic recording can significantly enhance the recording density. This paper investigates writing of dots that are not directly under the laser pulse. Such a shifted scheme of writing allows higher densities when used with shingled recording. A further increase in the recording density can be obtained by using composite structures, comprising a superparamagnetic writing layer, and a (doped) FePt storage layer. Effect of head velocity, Curie temperature variation, track mis-registration, and dot position jitter on the standard deviation of switching distribution is studied to evaluate the designs that offer data densities as high as ~16 Tbpsi.