Relations between coercivity and recording performances for Ba-ferrite particulate perpendicular media

Author

Isshiki, M. ; Suzuki, T. ; Ito, T. ; Ido, T. ; Fujiwara, T.

Author_Institution

Toshiba R & D Center, Kawasaki, Japan

Volume

21

Issue

5

fYear

1985

fDate

9/1/1985 12:00:00 AM

Firstpage

1486

Lastpage

1488

Abstract

Recording performances for Ba-ferrite particulate perpendicular magnetic tapes, with different coercivity values, $H_{c\\perp }$ =470- 1930 Oe, and other properties substantially unchanged, were investigated with ring-shaped heads. Noise was found to be independent of $H_{c\\perp }$ . It was ascertained that reproduced voltages and signal-to-noise ratios were constant and highest for $H_{c\\perp } > H_{co\\perp }, H_{co\\perp }$ being 600 - 700 Oe depending on recorded wavelength, and that they decreased in proportion to $H_{c\\perp }$ for $H_{c\\perp } < H_{co\\perp }$ . Therefore, Ba-ferrite tapes can be designed, with their highest performances, to adjust their coercivity so as to meet ferrite or metal head recording ability.

Keywords

Coercive forces; Ferrite materials/devices; Magnetic tape recording; Perpendicular magnetic recording; Coercive force; Ferrites; Magnetic anisotropy; Magnetic heads; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Signal to noise ratio; Voltage; Wavelength measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1985.1064050

Filename

1064050