High frequency characteristics of multi-layered CoTaZr cores for thin film heads

Author

Arai, R. ; Mitsuoka, K. ; Fukui, H. ; Akimoto, H. ; Narishige, S.

Author_Institution

Hitachi Ltd., Ibaraki, Japan

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2115

Lastpage

2117

Abstract

Multilayered cores made of CoTaZr amorphous films with alumina interlayers were prepared and their high-frequency characteristics were investigated in order to develop magnetic thin-film heads applicable to higher transfer rate use. Compared with single-layered cores, head noise and relaxation noises decrease significantly in multilayered cores. Head noise decreases over 20% in the frequency region of 40 MHz, while relaxation noises are reduced gradually as the number of layers increases. These results are attributed to the reduction of eddy current and core losses due to wall motions. Accordingly, multilayered CoTaZr films are expected to be used to fabricate thin-film heads with low noise

Keywords

cobalt alloys; eddy current losses; magnetic cores; magnetic heads; magnetic multilayers; magnetic properties of amorphous substances; magnetic thin film devices; noise; tantalum alloys; zirconium alloys; 1 to 40 MHz; Al₂O₃ interlayers; CoTaZr amorphous films; core losses; eddy current losses; head noise; high-frequency characteristics; multilayered cores; relaxation noises; thin film heads; transfer rate; wall motions; Amorphous materials; Core loss; Eddy currents; Frequency; Magnetic cores; Magnetic films; Magnetic heads; Magnetic noise; Noise reduction; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179414

Filename

179414