Title :
Wide band erasure caused by SUL domain wall in perpendicular recording media
Author :
Nishida, Y. ; Arai, R. ; Tanahashi, K. ; Nakamura, A. ; Tagawa, I.
Author_Institution :
Storage Technol. Res. Center, Hitachi Ltd., Kanagawa, Japan
Abstract :
The paper points out that soft magnetic underlayer (SUL) domain wall causes wide-band erasure in perpendicular recording media, and that laminated or multi-layered SUL can avoid this problem. Additionally, the spike noise produced by SUL causes bit error rate (BER) degradation. The types of SUL required to solve neighboring track erasure are similar to the approaches proposed to solve the spike noise problem. Thus, controlling the SUL domain is very important, not only for BER performance, but also for the reliability of the recorded information.
Keywords :
error statistics; magnetic domain walls; magnetic multilayers; perpendicular magnetic recording; soft magnetic materials; BER performance; SUL domain wall; air-bearing surface; field intensity; magnetic field; perpendicular recording media; single pole type writer; soft magnetic underlayer; spike noise; wideband erasure; Bit error rate; Frequency; Magnetic domain walls; Magnetic field measurement; Magnetic fields; Magnetic recording; Perpendicular magnetic recording; Position measurement; Soft magnetic materials; Wideband;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464099
