Fe-Pt media for perpendicular magnetic recording

Author

Suzuki, Toshio ; Honda, Naoki ; Ouchi, Kazuhiro

Author_Institution

Akita Res. Inst. of Adv. Technol., Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2748

Lastpage

2750

Abstract

Ordered Fe-Pt perpendicular magnetic recording media were studied in terms of the effects of magnetic domain sizes on the recording performances. As the domain size decreased, the magnetization reversal changed from the wall motion to the rotational mode, and the medium noise reduced. A high SNR, 39 dB_p-prms/, was achieved for a track width of 2.7 μm at a recording density of 100 kFRPI for a single-layer medium with an 82 nm magnetic domain size. On the other hand, little recording demagnetization was observed in the medium with a steep slope in the M-H loop. A composite medium with a soft-magnetic backlayer exhibited an extremely high signal output. The possibility of high recording resolution was discussed by the MFM spectrum analysis for the recording patterns

Keywords

demagnetisation; ferromagnetic materials; iron alloys; magnetic domains; magnetic force microscopy; magnetic recording noise; magnetic thin film devices; magnetisation reversal; perpendicular magnetic recording; platinum alloys; spectral analysis; 2.7 micron; 82 nm; FePt; M-H loop; MFM spectrum analysis; SNR; magnetic domain sizes; magnetization reversal; medium noise; perpendicular magnetic recording; recording demagnetization; recording density; recording patterns; recording performances; recording resolution; rotational mode; signal output; single-layer medium; soft-magnetic backlayer; track width; wall motion; Demagnetization; Disk recording; Magnetic domain walls; Magnetic domains; Magnetic noise; Magnetic recording; Magnetization reversal; Noise reduction; Perpendicular magnetic recording; Signal to noise ratio;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800973

Filename

800973