High frequency head and playback model for thin-film recording heads

Author

Corb, Brinton

Author_Institution

Appl. Magnetics Corp., Goleta, CA, USA

Volume

30

Issue

2

fYear

1994

fDate

3/1/1994 12:00:00 AM

Firstpage

394

Lastpage

403

Abstract

A thin-film head field and readback model that allows for eddy currents has been proposed and used to compute complex head efficiency, inductance, anomalous (ac) resistance, head saturation fields and locations, as well as the digital playback parametrics high and low frequency amplitude, resolution, PW-50, and maximum overwrite fields with a fair amount of accuracy. The head model solves for the time-dependent vector potential in a geometry that closely resembles a modern three dimensional thin-film recording head, including variable pole and yoke width, thickness, permeability, resistivity, neck angle and other geometrical parameters. Readback emulation is done with a discrete Fourier version of the reciprocity integral using Szczech fields and arctan transitions, along with complex efficiencies from the head model. Detailed comparisons with experimental observations are given

Keywords

eddy currents; electric resistance; inductance; magnetic heads; magnetic recording; magnetic thin film devices; modelling; AC resistance; HF head model; HF playback model; PW-50; complex head efficiency; digital playback parametrics; eddy currents; field/readback model; geometrical parameters; head saturation fields; high frequency model; inductance; maximum overwrite fields; neck angle; permeability; readback emulation; reciprocity integral; resistivity; resolution; thin-film recording heads; time-dependent vector potential; Conductivity; Eddy currents; Frequency; Geometry; Inductance; Magnetic heads; Neck; Permeability; Solid modeling; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.312293

Filename

312293