High frequency signal response of impedance matched UHF carrier type head

Author

Senda, Masakatsu ; Koshimoto, Yasuhiro

Author_Institution

NTT Integrated Inf. & Energy Syst. Labs., Tokyo, Japan

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3379

Lastpage

3381

Abstract

We examined the response to a high frequency signal field of a UHF carrier type thin-film head, which employs a permeability change at UHF. The use of a core/lead/core head element with a multilayer film core and the impedance matching technique made it possible to obtain a large output, a high sensitivity, and a broad bandwidth. We achieved a sensitivity of 4 mV/μm·Oe and a field resolution of ~10^-6 Oe for a 5 MHz-signal field in the 50 Ω-matched head. In order to examine bandwidth, we proposed using a leak field from a microstripline as a constant signal field for various frequencies. A 3 dB bandwidth of >100 MHz was estimated from experiment and calculation

Keywords

UHF devices; impedance matching; magnetic heads; magnetic multilayers; magnetic thin film devices; UHF carrier type thin-film head; bandwidth; core/lead/core element; field resolution; high frequency signal response; impedance matching; leak field; microstripline; multilayer film; permeability; sensitivity; Bandwidth; Circuits; Frequency; Giant magnetoresistance; Impedance; Impedance matching; Lead; Magnetic cores; Magnetic films; Magnetic heads; Microstrip; Nonhomogeneous media; Permeability; Signal resolution; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617950

Filename

617950