Thermal stability of magnetic recording in perpendicular thin film media

Author

Futamoto, Masaaki ; Hirayama, Yuzo ; Inaba, Nobuyuki ; Honda, Y. ; Ito, K. ; Kikugawa, A. ; Takeuchi, T.

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2802

Lastpage

2807

Abstract

Recording and signal decay characteristics of perpendicular CoCr-alloy thin film media are investigated in comparison with those of longitudinal media. A perpendicular medium shows recording resolution 25-32% higher than that of a longitudinal medium with similar low density output. The medium S/N of a 25 nm thick perpendicular medium is comparable to that of a 16 nm thick CoCrPt longitudinal medium at high linear densities. The signal decay rate of the high Mr/Ms perpendicular medium is below 0.2% per decade of time for all linear densities. These results and thermal stability considerations based on the temperature dependence of KuV/kT indicate that CoCr-alloy perpendicular recording media are promising to extend the linear density well beyond 400 kFCI

Keywords

chromium alloys; cobalt alloys; ferromagnetic materials; hard discs; magnetic recording noise; magnetic thin films; magnetocaloric effects; perpendicular magnetic recording; thermal stability; 25 nm; CoCr; high Mr/Ms perpendicular medium; linear density; low density output; magnetic recording; perpendicular CoCr-alloy thin film media; perpendicular medium; perpendicular thin film media; recording resolution; signal decay characteristics; signal decay rate; signal/noise ratio; temperature dependence; thermal stability; Crystallization; Indium tin oxide; Magnetic films; Magnetic heads; Magnetic noise; Magnetic recording; Perpendicular magnetic recording; Sputtering; Thermal stability; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800989

Filename

800989