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

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

3957

Lastpage

3959

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333956

Filename

333956