Title :
SNR improvement of granular perpendicular recording media
Author :
Zheng, M. ; Choe, G. ; Chekanov, A. ; Demczyk, B.G. ; Acharya, B.R. ; Johnson, K.E.
Author_Institution :
MMC Technol. Inc., San Jose, CA, USA
fDate :
7/1/2003 12:00:00 AM
Abstract :
In this paper, we address important issues on the performance improvement of perpendicular magnetic recording (PMR) media, such as noise reduction by adjusting the soft magnetic underlayer (SUL) properties and recording layer and intermediate layer modifications for optimum signal-to-noise (SNR) performance. The permeability of the SUL plays a significant role in writability and SNR. Proper pinning of the SUL should be considered for reducing spike noise. A systematic comparison of alloy and oxide granular media shows that optimized oxide media can provide both better SNR and good thermal stability and is promising for high-density recording.
Keywords :
granular materials; magnetic permeability; magnetic recording noise; perpendicular magnetic recording; soft magnetic materials; thermal stability; SNR improvement; SUL permeability; SUL pinning; alloy media; granular perpendicular recording media; high-density recording; intermediate layer modifications; magnetic recording media; noise reduction; optimum SNR performance; optimum signal-to-noise; oxide granular media; recording layer modifications; soft magnetic underlayer properties; spike noise reduction; thermal stability; writability; Disk recording; Magnetic heads; Magnetic recording; Noise reduction; Nonhomogeneous media; Permeability; Perpendicular magnetic recording; Signal to noise ratio; Soft magnetic materials; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.813777
