DocumentCode :
990074
Title :
Switching dynamics in a thin film recording head
Author :
Soohoo, R.F.
Author_Institution :
University of California, Davis, California
Volume :
18
Issue :
6
fYear :
1982
fDate :
11/1/1982 12:00:00 AM
Firstpage :
1128
Lastpage :
1130
Abstract :
The switching dynamics in a thin-film head for both the writing and reading modes are studied. To minimize magnetostatic energy, the film head is split up into multidomains subsequent to saturation writing in the hard (or track) direction. The domain structure is composed of elongated domains in the easy direction and closure domains at the edges. The results of our calculation show that domain wall motion contributes increasingly to the effective head permeability as the track width is decreased. In the readback process, it was found that the switching time for wall motion τw(∼170 ns) in the edge domains is some two orders of magnitude larger that τrfor rotation (∼1 ns) in the main domains. Since these motions are coupled due to the requirement of continuity of the perpendicular component of \\over\\rightarrow{M_{s}} at a 90° wall, the switching dynamics is dominated by wall motion. A finite distribution of wall motion threshold field Hocan give rise to different time delays in the head response, leading to distortions in the readback signal, including the presence of wiggles at the trailing edge.
Keywords :
Magnetic recording/reading heads; Magnetic switching; Magnetic domain walls; Magnetic domains; Magnetic heads; Magnetostatics; Permeability; Perpendicular magnetic recording; Saturation magnetization; Tracking; Transistors; Writing;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1982.1062004
Filename :
1062004
Link To Document :
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