DocumentCode :
1003861
Title :
The micromagnetics of thin-film disk recording tracks
Author :
Tong, H.C. ; Ferrier, R. ; Chang, P. ; Tzeng, J. ; Parker, K.L.
Author_Institution :
IBM Corporation, San Jose, CA
Volume :
20
Issue :
5
fYear :
1984
fDate :
9/1/1984 12:00:00 AM
Firstpage :
1831
Lastpage :
1833
Abstract :
This paper, for the first time, illustrates the details of the recorded tracks of thin film disks written with film heads flying 1600-2600 Å above the disk surfaces. The magnetic medium was a thin film of Fe-Co-Cr alloy with a Mrt of 2.8-2.9×10-3emu/cm2and a coercivity of 450-490 Oe. Readback signals were carefully taken from the tracks. They were then studied micromagnetically using ferrofluid decoration and Lorentz electron microscopy techniques. The bit pattern was essentially a series of isolated single domains with alternate magnetization along the circumferential direction of the disk. The transition zone consisted of sawtooth shaped, head-on domain walls. Bit shift, readback signal asymmetry, and the amplitude modulation due to overwrite were directly observed on the tracks microscopically. It was concluded that these phenomena could be related to the writability of the head with respect to the media.
Keywords :
Magnetic disk recording; Coercive force; Disk recording; Frequency; Magnetic films; Magnetic heads; Magnetic recording; Magnetic separation; Micromagnetics; Saturation magnetization; Transistors;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1984.1063269
Filename :
1063269
Link To Document :
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