Noise characteristics of double-layered perpendicular media using novel soft magnetic underlayer materials

Author

Kikukawa, Atsushi ; Honda, Yukio ; Hirayama, Yoshiyuki ; Futamoto, Masaaki

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2402

Lastpage

2404

Abstract

The read/write characteristics of perpendicular media with different soft magnetic underlayer (SMU) materials (Co-Nb-Zr, Co-Ta-Zr, Fe-Ta-C, and Fe-Al-Si), and identical recording layers were investigated using a spin-stand and a merged-type MR head. It was observed that there are strong correlations between the SMU materials and noise characteristics, and found that Co-Ta-Zr and Fe-Ta-C underlayers yield the lowest noise when combined with a Co-Cr-Pt-Ta magnetic recording layer. An advanced medium, made based on those findings, was tested and a maximum D₅₀ of 275 kFCl was observed by using a single pole-type writer and a GMR reader with a shield gap length of 80 nm

Keywords

magnetic film stores; magnetic recording noise; perpendicular magnetic recording; soft magnetic materials; Co-Nb-Zr; Co-Ta-Zr; Fe-Al-Si; Fe-Ta-C; double-layered perpendicular media; magnetoresistive head; noise characteristics; read/write characteristics; single pole-type writer; soft magnetic underlayer materials; spin-stand; Amorphous magnetic materials; Crystalline materials; Magnetic domain walls; Magnetic domains; Magnetic materials; Magnetic noise; Magnetic recording; Perpendicular magnetic recording; Soft magnetic materials; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908446

Filename

908446