Thin-film magnetic head using impedance change at high frequency

Author

Senda, Masakatsu ; Takei, Koji ; Ishii, Osamu ; Koshimoto, Yasiihiro

Author_Institution

NTT Interdisciplinary Res. Labs., Ibaraki, Japan

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

2709

Lastpage

2711

Abstract

This article reports on the reproducing characteristics of a new type of thin-film magnetic head, which is based on impedance change due to field dependent permeability at a frequency of several MHz. The head is flux responsive, and a field from a medium is perceived as an amplitude modulation of an AC carrier voltage and reproduced by detection. In order to obtain a large change, the head element is composed of magnetic core/sensing lead/magnetic core sandwich structure, and a NiFe/SiO₂ multilayer film is adopted for the cores. The lead is also used for a DC bias. A single pole type head and a ring type head, both with this simple core/lead/core structure, were examined for two fundamental operations, and were confirmed to exhibit a differential waveform and an integral waveform, respectively

Keywords

magnetic heads; magnetic multilayers; magnetic permeability; magnetic thin film devices; AC carrier voltage; NiFe-SiO₂; NiFe/SiO₂ multilayer film; amplitude modulation; differential waveform; flux response; high frequency impedance; integral waveform; magnetic core/sensing lead/magnetic core sandwich structure; permeability; reproducing characteristics; ring type head; single pole type head; thin-film magnetic head; Amplitude modulation; Frequency; Impedance; Lead; Magnetic cores; Magnetic films; Magnetic heads; Permeability; Sandwich structures; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490100

Filename

490100