Title :
CoPtCr-SiO2/Ru longitudinal media with C underlayer for high-density flexible disk
Author :
Moriwaki, K. ; Usuki, K. ; Nagao, M.
Abstract :
A high-density magnetic recording flexible disk (FD) medium on polyethylene naphthalate (PEN) substrate film with an Ru underlayer and CoPtCr-SiO2 magnetic layer was investigated. The Ru underlayer and magnetic layer were prepared at room temperature by a dc magnetron sputtering system using a roll-to-roll process. Media with and without an additional C underlayer were tested, and those with the C underlayer exhibited magnetostatic properties comparable to glass-substrate media (HD). Findings suggested that the C underlayer prevents outgassing from the PEN substrate film and improves the crystallinity of the Ru underlayer. The FD with C underlayer exhibited high-density magnetic recording properties.
Keywords :
cobalt alloys; magnetic disc storage; magnetic multilayers; magnetic recording; platinum alloys; polymer films; silicon alloys; sputtering; C underlayer; CoPtCr-SiO2; CoPtCr-SiO2 magnetic layer; PEN substrate film; Ru; Ru underlayer crystallinity; dc magnetron sputtering; flexible disk media; glass substrate media; high-density flexible disk; high-density magnetic recording media; magnetostatic property; polyethylene naphthalate substrate film; roll-to-roll process; Magnetic films; Magnetic properties; Magnetic recording; Magnetostatics; Plastic films; Polyethylene; Sputtering; Substrates; Temperature; Testing; CoPtCr–SiO; flexible disk; polyethylene naphthalate (PEN) substrate film; roll-to-roll sputtering process;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.855252
