Title :
A self-consistent model for overwrite modulation in thin film recording media
Author :
Roscamp, Thomas A. ; Curland, Nathan
Author_Institution :
Rosecamp Eng., San Diego, CA, USA
fDate :
11/1/1988 12:00:00 AM
Abstract :
Overwrite modulation is studied by using self-consistent iterations to calculate the written transition region as a function of the DC erased state of the medium. These written transitions are then superimposed for (2,7)-code overwrite test conditions, and Fourier series analysis is used to calculate overwrite. It is found that overwrite can be attributed to timing modulation due to the shifts in the locations of the transitions and to amplitude modulation due to different head field gradients (modified by demagnetizing fields) at the different transition locations. Image charges are found to have significant effect on the calculated results. Comparison is made with experimental data
Keywords :
magnetic recording; magnetic thin film devices; modulation; series (mathematics); (2,7)-code overwrite test conditions; DC erased state; Fourier series analysis; amplitude modulation; demagnetizing fields; head field gradients; image charges; overwrite modulation; self-consistent model; thin film recording media; timing modulation; transition locations; written transition region; Amplitude modulation; Data engineering; Demagnetization; Fourier series; Frequency; Head; Production; Switches; Testing; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
