Effect of chromium underlayer thickness on recording characteristics of CoCrTa longitudinal recording media

Author

Pressesky, J.L. ; Lee, S.Y. ; Heiman, N. ; Williams, D. ; Coughlin, T. ; Speliotis, D.E.

Author_Institution

Seagate Magnetics, Fremont, CA, USA

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1596

Lastpage

1598

Abstract

The bulk magnetic properties of the experimental disks were controlled in an attempt to isolate effects due to differences of underlayer morphology and crystallographic properties. In a comparison of films with similar bulk magnetic properties, recording performance advantages were observed for the films fabricated on thin chromium underlayers. Transition lengths were observed that are somewhat narrower than expected from a recording model based solely on bulk magnetic properties. Lower noise at the chosen recording density was also observed. It is hypothesized that the mechanism through which this transition length reduction occurs is associated with the greater cooperative switching behavior that is characteristic of the films prepared on thin Cr underlayers

Keywords

chromium; chromium alloys; cobalt alloys; crystal morphology; magnetic recording; magnetic thin films; magnetic transitions; tantalum alloys; CoCrTa-Cr; Cr; bulk magnetic properties; cooperative switching behavior; crystallographic properties; experimental disks; films; longitudinal recording media; recording characteristics; recording density; recording performance; transition length reduction; underlayer morphology; underlayer thickness; Chromium; Frequency; Magnetic films; Magnetic properties; Magnetic recording; Magnetometers; Pressure measurement; Substrates; Thickness measurement; Torque measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104459

Filename

104459