Title :
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
fDate :
9/1/2000 12:00:00 AM
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 Hc⊥ 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;
Journal_Title :
Magnetics, IEEE Transactions on
