Effect of soft underlayer permeability on wide area track erasure in perpendicular recording

Author

Zhou, Jianing ; Acharya, B. Ramamurthy ; Gill, Paramjit ; Abarra, E. Noel ; Zheng, Min ; Choe, Gunn

Author_Institution

MMC Technol., San Jose, CA, USA

Volume

41

Issue

10

fYear

2005

Firstpage

3160

Lastpage

3162

Abstract

The permeability of the magnetic soft underlayer (SUL) was systematically varied through SUL structure change, and its effect on wide area adjacent track erasure (ATE) and media overwrite (OW) was studied. Results suggest that ATE decreases with SUL permeability, and it involves only a finite thickness of the SUL. OW increases with SUL permeability as well as SUL thickness. In addition, ATE is less affected by magnetic spacing than OW. Antiparallel coupled SUL (APS) improves ATE. A double-APS structure with a permeability gradient is proposed to optimize OW and ATE performance.

Keywords

magnetic heads; magnetic permeability; perpendicular magnetic recording; soft magnetic materials; ATE performance; OW performance; SUL permeability; SUL structure; adjacent track erasure; antiferromagnetic coupling; antiparallel coupled SUL; magnetic soft underlayer; magnetic spacing; media overwrite; permeability gradient; perpendicular recording; soft underlayer permeability; wide area track erasure; Couplings; Disk recording; Gunn devices; Hard disks; Magnetic flux; Magnetic heads; Permeability; Perpendicular magnetic recording; Soft magnetic materials; USA Councils; Antiferromagnetic coupling; overwrite; permeability; perpendicular recording; soft underlayer; wide area adjacent track erasure;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2005.855275

Filename

1519240