The role of soft underlayer permeability in wide area track erasure in high-density perpendicular recording

Author

Zhou, J.N. ; Acharya, B.R. ; Gill, P. ; Abarra, E.N. ; Zheng, M. ; Choe, G.

Author_Institution

MMC Technol., San Jose, CA, USA

fYear

2005

fDate

4-8 April 2005

Firstpage

1335

Lastpage

1336

Abstract

The effect of the soft underlayer (SUL) permeability on adjacent track erasure (ATE) as well as on the recording performances of the media was investigated and verified. The 3 structures used were: single layer CoZrTa, and the antiferromagnetically coupled SULs (APS) CoZrTa/Ru/CoZrTa and CoZrTa/Ru/Co/CoZrTa. All samples were deposited on NiP-plated AlMg disk substrates. The 240 tracks were written once with 45 mA at 60 kfci and the stressing track was written for 32,000 revolutions with 55 mA at 360 kfci. Similar to previous observations, the APS structure largely suppressed the ATE. It was found that the total amount of flux an SUL is capable of conducting does not correlate well with ATE. However, ATE correlates well with permeability, suggesting that material property alone determines ATE.

Keywords

cobalt; cobalt alloys; magnetic flux; magnetic multilayers; magnetic permeability; magnetic thin films; perpendicular magnetic recording; ruthenium; soft magnetic materials; tantalum alloys; zirconium alloys; AlMg; CoZrTa-Ru-Co-CoZrTa; NiP-plated disk substrates; adjacent track erasure; antiferromagnetic coupling; flux; high-density perpendicular recording; permeability; recording performances; soft underlayer; stressing track; Antiferromagnetic materials; Disk recording; Material properties; Permeability measurement; Perpendicular magnetic recording; Stress measurement; Substrates; Writing;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464097

Filename

1464097