DocumentCode :
820974
Title :
Eddy currents and displacement currents in multi-layer soft magnetic films for recording heads
Author :
Tanabe, Shinji ; Ohji, Hiroshi ; Inoue, Kazunori ; Ozeki, Tatsuo
Author_Institution :
Mitsubishi Electric Corp., Hyogo, Japan
Volume :
28
Issue :
5
fYear :
1992
fDate :
9/1/1992 12:00:00 AM
Firstpage :
2620
Lastpage :
2622
Abstract :
An explanation of the magnetic properties of multilayered soft magnetic films is given from the viewpoint of mutual inductance, eddy current loss, and magnetic domain structure variation. The frequency response of the permeability was measured in several multilayered films. In order to clarify the variation of properties from sample to sample, 3-D-FEM (finite-element method) calculations including a time-dependent term were carried out. The permeability is found to decrease with decrease of insulator thickness because of the increase of the mutual inductance. One of the most important factors in decreasing the permeability is the phase difference between the surface and the inside of magnetic layer. If the metal film overlaps the insulator edges, the permeability is found to decrease due to an increase in eddy currents. Magnetic domain shape is shown to be correlated with the strip width and the insulator thickness
Keywords :
Permalloy; eddy current losses; ferromagnetic properties of substances; finite element analysis; frequency response; inductance; magnetic heads; magnetic multilayers; magnetic permeability; magnetic recording; 3 micron; 3D FEM; FeNi-CoZrNb-FeNi; FeNi-SiO2-FeNi; Permalloy-CoZr-Nb; Permalloy-SiO2; displacement currents; eddy current loss; finite-element method; frequency response; insulator thickness; magnetic domain shape; magnetic domain structure; multilayered soft magnetic films; mutual inductance; permeability; phase difference; recording heads; strip width; time-dependent term; Eddy currents; Frequency measurement; Frequency response; Inductance; Insulation; Magnetic domains; Magnetic films; Magnetic losses; Magnetic properties; Permeability;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.179576
Filename :
179576
Link To Document :
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