Overwrite characteristics of thin film head and media systems

Author

Akoh, S. ; Takagishi, M. ; Hiroshima, T.

Author_Institution

Sumitomo Metal Ind. Ltd., Amagasaki, Japan

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2454

Lastpage

2456

Abstract

The authors measured the saturation properties of overwrite on three thin-film heads with pole lengths of P=2.6 μm, 3.6 μm, and 4.4 μm in combination with three thin-film media with coercivities of H_c=1200 Oe, 1300 Oe, and 1550 Oe. The 4.4-μm head shows an interesting saturation profile in which overwrite first reaches the minimum MMF (magnetomotive force) value of around 0.45 AT and then increases for larger MMF. Regarding this resonance-like phenomenon, the overwrite properties were shown to be strongly dependent upon leading pole length and overwritten (LF) bit length, as well as on the overwriting frequency (HF). It is concluded that when designing heads, the optimum pole length should be selected to satisfy both the overwrite and readback characteristics at any track of the drive

Keywords

coercive force; magnetic heads; magnetic thin film devices; coercivities; magnetomotive force; overwrite properties; pole lengths; readback characteristics; saturation properties; thin-film heads; thin-film media; Coercive force; Force measurement; Frequency; Hafnium; Length measurement; Magnetic heads; Magnetic properties; Magnetic resonance; Saturation magnetization; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104762

Filename

104762