Title :
Seedlayer and preheating effects on crystallography and recording performance of CoCrPtB perpendicular media
Author :
Zheng, Min ; Choe, Geon ; Johnson, Kenneth E. ; Gao, Lan ; Liou, Sy-Hwang
Author_Institution :
MMC Technol. Inc., San Jose, CA, USA
fDate :
9/1/2002 12:00:00 AM
Abstract :
The effects of seedlayer (SL) and preheating on the crystallographic, magnetic, and recording properties of CoCr18Pt16B4 granular perpendicular magnetic media have been investigated. For the media with Ru as underlayer, although higher preheating improves both coercivity and squareness, the media is much noisier. With introducing Ta SL, Ru (0002)/Co (0002) crystallography is greatly enhanced. High coercivity, unity squareness, and negative nucleation field are achieved even at low preheating without degrading signal-to-noise ratio. In addition, the media is magnetically stable for a wide range of recording density.
Keywords :
boron alloys; chromium alloys; cobalt alloys; coercive force; magnetic hysteresis; magnetic multilayers; magnetic recording noise; perpendicular magnetic recording; platinum alloys; sputtered coatings; thermal stability; CoCr18Pt16B4 granular perpendicular magnetic media; CoCr18Pt16B4-Ru-Ta; CoCrPtB perpendicular media; Ru underlayer; Ta seedlayer; coercivity; crystallography; magnetic properties; magnetic stability; media noise; negative nucleation field; preheating effects; recording performance; recording properties; seedlayer effects; signal-to-noise ratio; squareness; thermal stability; Coercive force; Crystallography; Magnetic properties; Magnetic recording; Perpendicular magnetic recording; Signal to noise ratio; Soft magnetic materials; Thermal degradation; Thermal stability; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801792
