Improvement of read/write characteristics of sputtered Ba ferrite disks by adding Ta into Pt underlayers

Author

Feng, J. ; Funabashi, N. ; Murakoso, T. ; Nakagawa, S. ; Naoe, M.

Author_Institution

Dept. of Phys. Electron., Tokyo Inst. of Technol., Yokohama, Japan

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2408

Lastpage

2410

Abstract

Ba ferrite (BaM) disks with Pt and Pt-Ta underlayers were deposited by facing targets sputtering (FTS) apparatus. The effects of Ta addition into Pt underlayers on magnetic and crystallographic characteristics of BaM layers were investigated. The grain size of Pt-Ta underlayers was decreased with addition of Ta into Pt underlayers, and so the grain size of the BaM layers deposited on them decreased. The H _c⊥ and S_⊥ of Ba ferrite layers were increased with addition of Ta into Pt underlayers. Recording characteristics of BaM/Pt-Ta and BaM/Pt disks were investigated. BaM/Pt-Ta disks revealed better read/write characteristics than BaM/Pt disks due to their smaller grain size, high H_c⊥ of 3.4 kOe and larger S_⊥. The D₅₀ value of 171 kFRPI was acquired in the BaM/Pt-Ta disk, which is promising for ultra-high density recording media

Keywords

barium compounds; ferrites; grain size; magnetic disc storage; magnetic thin films; perpendicular magnetic recording; sputter deposition; BaFe₂O₄-PtTa; Pt-Ta underlayers; Ta addition; facing targets sputtering; grain size; read/write characteristics; recording characteristics; sputtered Ba ferrite disks; ultra-high density recording media; Crystallization; Crystallography; Disk recording; Ferrite films; Grain size; Magnetic anisotropy; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Sputtering; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908448

Filename

908448