Title :
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
fDate :
6/1/2007 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.893120
