Micromagnetics and Eddy Current Effects in Magnetic Recording Heads

Author

Takano, Kenichi ; Zhang, Xiaofeng ; Salhi, El-Amine ; Guan, Lijie ; Sakai, Masanori ; Smyth, Joe ; Dovek, Moris

Author_Institution

Headway Technol. Inc., Milpitas, CA

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2184

Lastpage

2186

Abstract

We developed a micromagnetic modeling program for magnetic recording head analysis, taking eddy current effects into account, and studied the 1-GHz high-frequency response. When gyromagnetic precession is dominant with a small damping parameter of 0.01, the eddy current field causes the delay of the response, but the head field intensity increases a lot, compared to the no eddy current case, because the eddy current field cancels the precessional motion and improves the magnetization alignment. Since magnetic soft films have an intrinsic small damping, low-resistivity material is preferable for high-end magnetic recording heads

Keywords

eddy currents; gyromagnetic effect; magnetic recording; magnetic thin films; magnetisation; micromagnetics; damping parameter; eddy current effects; eddy current field; gyromagnetic precession; high-end magnetic recording head; intrinsic small damping; low-resistivity material; magnetic recording head analysis; magnetic recording heads; magnetic soft films; magnetization; micromagnetic modeling; micromagnetics; Damping; Delay; Eddy currents; Gyromagnetism; Magnetic analysis; Magnetic heads; Magnetic materials; Magnetic recording; Micromagnetics; Soft magnetic materials; Eddy current; finite-element method (FEM); magnetic heads; micromagnetic modeling;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893120

Filename

4202937