Title :
Low-noise CoCrPtO perpendicular media with improved resolution
Author :
Velu, E.M.T. ; Malhotra, Sudhir ; Bertero, Gerardo ; Wachenschwanz, David
Author_Institution :
Komag Inc., San Jose, CA, USA
fDate :
3/1/2003 12:00:00 AM
Abstract :
CoCrPtO perpendicular media with coercivities greater than 6000 Oe, Mr/Ms equal to 1.0, and negative nucleation fields exceeding 3000 Oe were produced. The crystallographic, magnetic, and recording properties were optimized with respect to Ru interlayer and CoTaZr soft-underlayer thicknesses. Media with exchange decoupled magnetic grains as small as 7 nm with a narrow size distribution capable of supporting a linear density up to 720 kfci were produced. Thermal decay measured at 50 kfci at ambient temperature was less than 0.1%.
Keywords :
chromium alloys; cobalt alloys; coercive force; crystal microstructure; grain size; magnetic hysteresis; magnetic multilayers; magnetic recording noise; magnetic thin films; perpendicular magnetic recording; platinum alloys; storage media; thermal stability; 7 nm; CoCrPtO perpendicular media; CoCrPtO-Ru-CoTaZr; CoTaZr soft-underlayer thickness; Ru interlayer thickness; crystallographic properties; double-layer perpendicular media; exchange decoupled magnetic grains; high-coercivity media; low-noise perpendicular media; magnetic properties; negative nucleation fields; recording properties; thermal decay; Coercive force; Magnetic films; Magnetic heads; Magnetic hysteresis; Magnetic properties; Magnetometers; Perpendicular magnetic recording; Signal to noise ratio; Soft magnetic materials; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.808991
