Title :
CrMn underlayers for CoCrPt thin film media
Author :
Lee, Li-Lien ; Laughlin, David E. ; Lambeth, David N.
Author_Institution :
Intevac Inc., Santa Clara, CA, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
An improved CoCrPt thin film medium for longitudinal magnetic recording which has a coercivity significantly greater than prior CoCrPt thin film media was investigated. A CrMn alloy underlayer was used, instead of the conventional Cr underlayer. A coercivity value of 4280 Oe was easily reached in a CoCrPt film on a 50 nm thick CrMn underlayer as compared to 2810 Oe with a pure Cr underlayer. It was found that the coercivity increase due to the Mn addition was realized if the substrates were preheated before the sputtering. Grain boundary interdiffusion of Mn from the underlayer to the magnetic layer may be the cause for the coercivity increase
Keywords :
chemical interdiffusion; chromium alloys; cobalt alloys; coercive force; grain boundary diffusion; magnetic recording; magnetic thin films; manganese alloys; platinum alloys; sputtered coatings; CoCrPt thin film media; CrMn; CrMn underlayer; CrMn-CoCrPt; Mn addition; Mn grain boundary interdiffusion; coercivity; longitudinal magnetic recording; magnetic layer; preheated substrates; sputtered coatings; Chromium alloys; Cobalt alloys; Coercive force; Lattices; Magnetic films; Manganese alloys; Plasma measurements; Platinum alloys; Sputtering; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
