Title :
Advanced multilayer thin films for ultra-high density magnetic recording media
Author :
Glijer, Pawel ; Sivertsen, John M. ; Judy, Jack H.
Author_Institution :
Dept. of Chem. Eng. & Mater. Sci., Minnesota Univ., Minneapolis, MN, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
The magnetic and structural properties of three high-coercivity, low moment multilayers for ultra-high density magnetic recording media were examined. The CoCrPt/Cr/CoCrPt multilayer exhibited extremely small grain size (~80 Å) and high in-plane coercivity of 3700 Oe. The Cr interlayer caused decoupling of the magnetic layers which led to low S* and low medium noise. The CoCrPt/CoCrPt/CoCrPt multilayer with different amount of intergranular coupling within sublayers exhibited high coercivity ~2700 Oe and S*=0.90. CoCrPt/CoCrTa multilayer exhibited improved in-plane anisotropy due to larger amount of in-plane oriented c-axes. This led to high coercivity ~3700 Oe and S*=0.88. Also fine grain diameters were observed in this film. Results obtained suggest that it is possible to produce CoCrPt-based multilayers with properties and structure required for 10 Gbit/inch2 longitudinal thin film magnetic recording media
Keywords :
chromium; chromium alloys; cobalt alloys; coercive force; ferromagnetic materials; grain size; magnetic anisotropy; magnetic disc storage; magnetic multilayers; magnetic thin film devices; platinum alloys; tantalum alloys; 80 angstrom; CoCrPt-CoCrPt-CoCrPt; CoCrPt-CoCrTa; CoCrPt-Cr-CoCrPt; CoCrPt/CoCrPt/CoCrPt multilayer; CoCrPt/CoCrTa multilayer; CoCrPt/Cr/CoCrPt multilayer; fine grain diameters; grain size; high-coercivity multilayers; in-plane anisotropy; in-plane coercivity; in-plane oriented c-axes; intergranular coupling; longitudinal thin film magnetic recording media; low moment multilayers; magnetic layer decoupling; multilayer thin films; structural properties; ultra-high density magnetic recording; Chromium; Coercive force; Grain size; Magnetic anisotropy; Magnetic films; Magnetic multilayers; Magnetic noise; Magnetic properties; Magnetic recording; Perpendicular magnetic anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
