High magnetic field sensitivity of TbFeCo layer and Pt/Co multilayers with an ultra-thin RE-rich RE-TM layer

Author

Ishida, Masaya ; Katsuyama, Takanobu ; Kawase, Takeo ; Nebashi, Satoshi ; Shimoda, Tatsuya

Author_Institution

Seiko Epson Corp., Nagano, Japan

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3229

Lastpage

3231

Abstract

We studied the magnetic field sensitivity of double layer disks which were composed of a TbFeCo recording layer with low Tb content and a high-T_c RE-rich DyFeCo ultra-thin layer. The Tb₁₄Fe₈₂Co₄/Dy₃₀Fe₃₅Co₃₅ double layer disk has better magnetic field sensitivity than a TbFeCo single recording layer disk. It was found that the film having such a large magnetization as Tb₁₄Fe₈₂Co₄ can be used for MO materials. Furthermore, we investigated the Pt/Co multilayers as a recording layer with an ultra-thin RE-TM layer. The addition of the ultra-thin RE-rich TbCo layer on the Pt/Co multilayers is effective for improvement of the C/N and the field sensitivity as well as that on the TbFeCo recording layer

Keywords

cobalt; cobalt alloys; dysprosium alloys; ferromagnetic materials; iron alloys; magnetic disc storage; magnetic domains; magnetic hysteresis; magnetic multilayers; magnetic thin films; magnetisation; magneto-optical recording; platinum; terbium alloys; C/N improvement; DyFeCo; MO materials; Pt-Co; Pt/Co multilayers; Tb₁₄Fe₈₂Co₄-Dy₃₀Fe ₃₅Co₃₅; Tb₁₄Fe₈₂Co₄/Dy₃₀Fe ₃₅Co₃₅ double layer disk; TbFeCo; TbFeCo recording layer; double layer disks; high magnetic field sensitivity; high-T_c RE-rich DyFeCo ultra-thin layer; large magnetization; magneto-optical system; ultra-thin RE-rich RE-TM layer; Disk recording; Iron; Magnetic fields; Magnetic films; Magnetic force microscopy; Magnetic materials; Magnetic modulators; Magnetic multilayers; Magnetic recording; Magnetization; Magnetooptic recording; Multilevel systems; Nonhomogeneous media; Optical films;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617900

Filename

617900