Investigation of Higher Recording Density Using an Improved Co–CoO Metal Evaporated Tape With a GMR Reproducing Head

Author

Motohashi, Kazuyuki ; Sato, Takao ; Samoto, Tetsuo ; Ikeda, N. ; Sato, Takao ; Ono, H. ; Onodera, S.

Author_Institution

Chem. Device Bus. Group, Sony Corp., Miyagi

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2325

Lastpage

2327

Abstract

To demonstrate the highest areal recording density of tape media, we have developed a metal evaporated tape with higher magnetic anisotropy of 2.5times10⁵ J/m³ and finer magnetic activation volume of 2.7times10^-24 m³ of a Co-CoO recording layer deposited on a smoother base film. A capability of an areal recording density of 23.0 Gb/in² was confirmed using a giant magnetoresistive head as a read head. The smoother surface roughness improved signal-to-noise ratio more than 2 dB

Keywords

cobalt; cobalt compounds; ferromagnetic materials; giant magnetoresistance; magnetic anisotropy; magnetic heads; magnetic recording; surface roughness; Co-CoO; GMR reproducing head; giant magnetoresistive head; magnetic anisotropy; magnetic tape recording; metal evaporated tape; recording density; signal-to-noise ratio; surface roughness; Giant magnetoresistance; Magnetic anisotropy; Magnetic field measurement; Magnetic films; Magnetic heads; Magnetic recording; Perpendicular magnetic anisotropy; Rough surfaces; Signal to noise ratio; Surface roughness; Areal recording density; giant magnetoresistive head; magnetic tape recording; metal evaporated;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893138

Filename

4202852