The FMR magnetic reproducing head using a microwave guide

Author

Sugiyama, Y. ; Kagawa, K. ; Ohmori, H. ; Hayashi, K. ; Hayakawa, M. ; Aso, K.

Author_Institution

Sony Corp. Res. Center, Yokohama, Japan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3867

Lastpage

3869

Abstract

A flux sensitive magnetic reproducing head using permeability change of magnetic thin films by the magnetic flux from the media is described. The head consists of a short-circuited coplanar type guide and a flux sensor of magnetic thin films located at the end of the waveguide. It is shown that the permeability change is enlarged by using ferromagnetic resonance, and it can be detected by rectifying the voltage amplitude of the standing wave in the waveguide. In the reproducing measurement from a magnetic tape, in which the relative speed between the head and the tape is 5 m/s, a signal of 1 mV and C /N=50 dB are obtained at 1 MHz with microwave power of 15 dBm

Keywords

ferromagnetic resonance; magnetic heads; magnetic permeability; magnetic thin film devices; 1 MHz; 1 mV; FMR magnetic reproducing head; ferromagnetic resonance; flux sensitive; magnetic flux; magnetic tape; magnetic thin films; microwave guide; microwave power; permeability change; short-circuited coplanar type guide; standing wave; Coplanar waveguides; Magnetic films; Magnetic flux; Magnetic heads; Magnetic resonance; Magnetic sensors; Permeability; Thin film sensors; Voltage; Waveguide transitions;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281325

Filename

281325