Title :
Problems in magnetic recording on relatively thick media
Author :
Hatoyama, Geokge M. ; Ohkubo, Hiroyuki ; Kikuchi, Saburo
Author_Institution :
Sony Magnescale, Inc., Shinagawaku, Tokyo, Japan
fDate :
9/1/1972 12:00:00 AM
Abstract :
The decay of a magnetic scale signal due to repeated reading is measured, and its relation to the magnetic properties of the recording material is studied. A sine-wave signal of wavelength 0.2 mm is recorded on Cu-Ni-Fe alloy plates 0.3 mm thick. The signal is read by a flux-sensitive multigap reading head. It is found that the penetration of the recorded signal into ordinary Cunife (Cu:Ni:Fe = 60:20:20; Br= 5 kG, Hc= 370 Oe) is only a few μm. Both the "magnetic wear" and the depth of the signal penetration has been improved over Cunife by reducing the Br/Hcratio down to about 5.
Keywords :
Copper-nickel-iron alloy; Iron-nickel-copper alloys; Magnetic recording materials; Cobalt alloys; Demagnetization; Length measurement; Magnetic heads; Magnetic materials; Magnetic properties; Magnetic recording; Manganese alloys; Thickness measurement; Wavelength measurement;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1972.1067459
