Title :
Studies of the "magnetizing region" of a ring-type recording head
Author_Institution :
3M Company, 3M Center, St.Paul, Minnesota
fDate :
11/1/1982 12:00:00 AM
Abstract :
The region within which a recording head changes the magnetization state of adjacent recording media was investigated for a 142 μm gap-length ring-head using a dc-pulse recording technique, with varying head-to-tape spacing up to 965 μm. For longitudinal easy-axis recording media, the ,"magnetizing region" has an approximately circular cross-section, with the radius proportional to current amplitude, and inversely proportional to media coercive force. Signal amplitude, read in contact from different "sublayers", decreased with increased record head-to-tape spacing, and with decreasing angle between the boundary of the magnetizing region and the surface of the recording media. Magnetic spacing material containing γ-Fe2O3particles caused a small increase in the radius of the cross-section of the "magnetizing region", but had little effect on signal amplitude for dc-pulse signals. For isotropic recording media, the configuration of the "magnetizing region" is modified by the combined effect of in-plane and perpendicular head field components.
Keywords :
Magnetic recording/reading heads; Coercive force; Magnetic anisotropy; Magnetic flux; Magnetic heads; Magnetic materials; Magnetic recording; Magnetic separation; Magnetization; Perpendicular magnetic anisotropy; Perpendicular magnetic recording;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1982.1062136