Two dimensional model of eddy currents and saturation in thin film write heads

Author

Torabi, Adam F. ; Mallary, Michael L. ; Perry, Robert ; Kimball, Greg

Author_Institution

Quantum Corp., Louisville, CO, USA

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1465

Lastpage

1467

Abstract

A two-dimensional model of an MR write head has been constructed using a finite element model. The model includes the eddy currents as well as nonlinear saturation of recording head material. The recording head field (deep gap field) was calculated as a function of write-current frequency and amplitude for two recording-head materials, standard 80/20 NiFe and high saturation magnetization Ms material 50/50 NiFe. The analysis was also done in the time domain and was compared with experimental data on field response, using both a microloop apparatus and impedance measurements. Fair agreement was obtained between the model and the data. The deep gap field has a time delay relative to the write current, which varies as a function of current frequency and amplitude

Keywords

eddy currents; iron alloys; magnetic heads; magnetic thin film devices; magnetoresistive devices; nickel alloys; deep gap field; eddy currents; finite element model; impedance measurements; magnetoresistive head; microloop apparatus; recording head field; saturation; thin film write heads; time delay; two-dimensional model; write-current frequency; Eddy currents; Finite element methods; Frequency; Impedance measurement; Magnetic analysis; Magnetic heads; Magnetic materials; Saturation magnetization; Time domain analysis; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706584

Filename

706584