Magnetic recording on FePt and FePtB intermetallic compound media

Author

Li, Ning ; Lairson, Bruce M.

Author_Institution

Seagate Technol., Bloomington, MN, USA

Volume

35

Issue

2

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

1077

Lastpage

1082

Abstract

Near-contact recording on high-coercivity FePt intermetallic compound media using a high B_sat write element was investigated. Untextured FePt media were prepared by magnetron sputtering on ZrO₂ disks at a substrate temperature of 450°C, with postannealing at 450°C for 8 h. Both multilayer and cosputtered precursors produced the ordered tetragonal L1₀ phase with high coercivity between 5 and 12 kOe. To improve readback noise and decrease magnetic domain size, FePtB media were subsequently prepared by cosputtering. Overwrite, roll-off, signal-to-noise ratio (SNR), and nonlinear transition shift (NLTS) were measured by both metal-in-gap and merged magneto-resistive heads. FePtB media showed NLTS similar to that of commercial CoCrPtTa longitudinal media, but 5 dB lower SNR. By operating recording transducers in near contact, reasonable values of overwrite (>30 dB) could be obtained

Keywords

boron alloys; coercive force; iron alloys; magnetic recording; magnetic recording noise; magnetic thin films; platinum alloys; sputtered coatings; 450 C; FePt; FePtB; annealing; coercivity; cosputtering; intermetallic compound; magnetic domain size; magnetoresistive head; magnetron sputtering; metal-in-gap head; multilayer; near-contact magnetic recording; nonlinear transition shift; overwrite; readback noise; roll-off; signal-to-noise ratio; thin film; transducer; Coercive force; Disk recording; Intermetallic; Magnetic domains; Magnetic multilayers; Magnetic noise; Magnetic recording; Signal to noise ratio; Sputtering; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.748856

Filename

748856