Interlayer exchange coupling in Co/Cr/Co double-layered recording films studied by spin-wave Brillouin scattering

Author

Murayama, A. ; Miyamura, M. ; Miyata, K. ; Oka, Y.

Author_Institution

Asahi Glass Co. Ltd., Yonezawa, Japan

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5064

Lastpage

5066

Abstract

Exchange coupling between Co layers through a Cr interlayer in sputtered Co/Cr/Co films has been studied by Brillouin scattering of spin waves by changing the thickness of the Cr interlayer up to 50 Å. The Brillouin spectrum consists of two spin-wave modes due to the Co double-layered structure which depends on the Cr-layer thickness. From the frequencies of the spin-wave modes, the interlayer exchange coupling A₁₂ varying with the Cr layer is determined by using Hillebrands´ theory. The exchange coupling through the nonmagnetic layer decreases with increase of the Cr thickness and becomes negligible for the Cr layer thicker than 20 Å. The result is compared with the media noise in double-layered CoCrPt alloy films with a Cr interlayer

Keywords

Brillouin spectra; chromium; cobalt; exchange interactions (electron); magnetic recording; magneto-optical effects; spin waves; Co-Cr-Co; Hillebrands´ theory; double-layered recording films; interlayer exchange coupling; media noise; spin-wave Brillouin scattering; Brillouin scattering; Chromium; Elementary particle exchange interactions; Magnetic films; Magnetic noise; Magnetic recording; Magnetic separation; Magnetostatic waves; Noise reduction; Perpendicular magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278741

Filename

278741