Magnetic properties and recording performance of multilayer films of CoCrTa, CoCrPtTa, and CoCrPtTa with CoCrPtB

Author

Song, L.W. ; Gardner, R.A. ; McLaurin, S.K. ; Sedighi, M.

Author_Institution

Akashic Memories Corp., San Jose, CA, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4011

Lastpage

4013

Abstract

Magnetic media composed of thin Cr layers between layers of CoCrTa, CoCrPtTa, or CoCrPtTa with CoCrPtB were fabricated and tested. The effects of the Cr interlayer thickness, and the ratio of top and bottom layer thickness on magnetic recording performance-were evaluated for the different materials. Results show that signal-to-noise performance improves and other recording properties, such as pulse width, generally degrade. The cases of multilayers composed of a top layer of CoCrPtTa and a bottom layer of CoCrPtTa or CoCrPtB show the unusual behavior that not only can noise characteristics be improved compared to single layer films, but optimization of the film geometry can produce pulse width and overwrite without significant degradation. This behavior is attributed to coercivity gradients and independent switching behavior of the top and bottom films

Keywords

boron alloys; chromium alloys; cobalt alloys; coercive force; magnetic multilayers; magnetic recording noise; platinum alloys; tantalum alloys; CoCrPtTa-Cr-CoCrPtB; CoCrPtTa-Cr-CoCrPtTa; CoCrTa-Cr-CoCrTa; Cr interlayer; coercivity gradients; magnetic properties; magnetic recording; multilayer films; overwrite; pulse width; signal-to-noise performance; switching; Chromium; Degradation; Magnetic films; Magnetic materials; Magnetic multilayers; Magnetic properties; Magnetic recording; Performance evaluation; Space vector pulse width modulation; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333973

Filename

333973