Title :
Analysis on magnetization transition of CGC perpendicular media
Author :
Muraoka, H. ; Sonobe, Y. ; Miura, K. ; Goodman, A.M. ; Nakamura, Y.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
7/1/2002 12:00:00 AM
Abstract :
Modeling and read/write characteristics of coupled granular/continuous (CGC) perpendicular recording media are described. The media consists of a continuous layer with a strong in-plain exchange coupling and a granular layer with magnetically isolated grain structure. The two layers are coupled by interlayer exchange coupling. Hysteresis loop squareness approaching unity is realized in CGC samples with only a 3-6 nm continuous layer on a CoCrPt granular layer. An approximated energy calculation shows a domain-wall pinning effect and transition smoothing due to interlayer exchange coupling between the two layers. Read/write measurements for the CGC media indicate signal-to-noise ratio improvement in association with transition jitter reduction, which suggests transition smoothing. Thermal stability is improved by interlayer exchange interaction
Keywords :
chromium alloys; cobalt alloys; exchange interactions (electron); ferromagnetic materials; magnetic domain walls; magnetic hysteresis; perpendicular magnetic recording; platinum alloys; thermal stability; 3 to 6 nm; CGC perpendicular media; CoCrPt; approximated energy calculation; coupled granular/continuous media; domain-wall pinning effect; hysteresis loop squareness; in-plain exchange coupling; interlayer exchange coupling; magnetically isolated grain structure; magnetization transition; read/write characteristics; signal-to-noise ratio improvement; thermal stability; transition jitter reduction; transition smoothing; Couplings; Jitter; Magnetic analysis; Magnetic domains; Magnetic hysteresis; Magnetization; Perpendicular magnetic recording; Signal to noise ratio; Smoothing methods; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.1017747
