Anti-parallel coupled soft under layers for high-density perpendicular recording

Author

Acharya, B.R. ; Zhou, J.N. ; Zheng, M. ; Choe, G. ; Abarra, E.N. ; Johnson, K.E.

Author_Institution

MMC Technol., San Jose, CA, USA

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2383

Lastpage

2385

Abstract

A promising soft magnetic under layer (SUL) structure consisting of anti-parallel coupled soft layers (APS) is investigated to improve the performance of high-density perpendicular recording media. CoCrPt-O recording media with average grain diameter ∼6 nm, coercivity of 5 kOe and nucleation field of -2 kOe is fabricated on both conventional SUL and APS. Wide-area adjacent track erasure (ATE) is observed for conventional SUL, which increases at lower interlayer spacing (t_IL). APS structure enables the suppression of ATE even up to t_IL=10 nm. Moreover, APS leads to reduced dc erase noise and improved signal to noise ratio particularly for SUL thicknesses <100 nm.

Keywords

cobalt alloys; perpendicular magnetic recording; soft magnetic materials; APS structure; CoCrPt-O; SUL structure; anti-parallel coupled soft under layers; dc erase noise reduction; grain diameter; high-density perpendicular recording; interlayer spacing; nucleation field; oxide media; recording media; recording performance; signal to noise ratio improvements; soft magnetic under layer; wide-area adjacent track erasure; Magnetic anisotropy; Magnetic recording; Magnetic separation; Permeability; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Signal to noise ratio; Soft magnetic materials; Writing; Adjacent track erasure; oxide media; perpendicular recording; recording performance; soft magnetic under layer;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832165

Filename

1325512