Dynamic performance of sequentially prepared magneto-optical TbFeCo disks

Author

Lee, Ho-Chan ; Cho, Yoong-Gook ; Yang, Chang-Sun ; Shin, Sung-Chul

Author_Institution

SKC Ltd., ChonAn, South Korea

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1712

Lastpage

1714

Abstract

TbFeCo magnetooptical recording disks were prepared by sequential DC magnetron sputtering of Tb and FeCo, and the dependence of dynamic performance on the repeat distance, which was varied from 7 Å to 45 Å, was investigated. The carrier-to-noise ratio (CNR) of 54 dB measured at the dynamic test conditions of 3.7-MHz carrier frequency and 30-kHz bandwidth remained constant up to the repeat distance of 16 Å and then decreased linearly with further increase of the repeat distance. The writing sensitivity of the sequentially sputtered samples was improved by 1-3 mW, depending on the repeat distance, compared with alloy-sputtered disks. It is concluded that sequential sputtering is very attractive in the fabrication of TbFeCo films since it provides more sensitive and reliable magnetooptical recording media than alloy sputtering

Keywords

cobalt alloys; iron alloys; magneto-optical recording; terbium alloys; 3.7 MHz; 30 kHz; TbFeCo disks; alloy-sputtered disks; carrier-to-noise ratio; dynamic performance; dynamic test conditions; fabrication; magnetooptical recording disks; repeat distance; sequential DC magnetron sputtering; sequentially sputtered samples; writing sensitivity; Amorphous magnetic materials; Magnetic anisotropy; Optical films; Optical recording; Optical sensors; Perpendicular magnetic anisotropy; Signal to noise ratio; Sputtering; Testing; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104501

Filename

104501