Influence of remanence magnetization on asymmetry of reproducing signals in 4MB FDD heads

Author

Murata, Yuichiro ; Tanabe, Shinji ; Ozeki, Tatsuo ; Handa, Seiichi

Author_Institution

Adv. Technol. R&D Center, Mitsubishi Electr. Corp., Hyogo, Japan

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

3515

Lastpage

3517

Abstract

A head combined with a read/write (R/W) gap and a pre-erase gap has been adopted for 4 MB flexible disk drives. The cross-talk coupling from the erase head to the R/W head can be suppressed by decreasing the permeability of the head material. However, decreasing the permeability of the erase head material increases the coercive force. Therefore, a remanence magnetization is induced in the erase head core during the reproducing process, which increases the asymmetry of reproduced waveforms. In order to decrease this asymmetry, a head with back gaps is developed. By controlling the back gap length to minimize the cross-talk, it is possible to realize both low asymmetry and low cross-talk simultaneously for 4 MB FDD heads

Keywords

coercive force; crosstalk; ferrite devices; floppy discs; magnetic heads; magnetic permeability; magnetic recording noise; remanence; 4 MB; FDD heads; MnZn ferrite; MnZnFe₂O₄; NiZn ferrite; NiZnFe₂O₄; back gaps; coercive force; cross-talk coupling suppression; erase head core; flexible disk drives; head material permeability; pre-erase gap; read/write gap; remanence magnetization; reproducing signal asymmetry; Ceramics; Coercive force; Disk drives; Magnetic cores; Magnetic heads; Magnetic materials; Magnetization; Permeability; Remanence; Research and development;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.538675

Filename

538675