Title :
Microscopic noise and signal characteristics of perpendicular recording medium studied by magnetic force microscopy
Author :
Honda, Y. ; Hirayama, Y. ; Ito, K. ; Futamoto, M.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
9/1/1997 12:00:00 AM
Abstract :
Signal and noise characteristics around the recorded track edges of a CoCrTa perpendicular medium are investigated in a microscopic scale by magnetic force microscopy coupled with Fourier-analysis. The noise level within the recorded region is higher than that of DC erased region, and the medium noise near the both track-edges is higher than that measured at the recorded track center. Sharp off-track overwrite profiles are confirmed when the low-frequency signal (45 kFCI) is off-track overwritten by the high-frequency signal (200 kFCI)
Keywords :
Fourier analysis; chromium alloys; cobalt alloys; magnetic force microscopy; magnetic recording noise; perpendicular magnetic recording; tantalum alloys; CoCrTa; Fourier analysis; magnetic force microscopy; microscopic noise; off-track overwrite profile; perpendicular recording medium; signal characteristics; track edge; Couplings; Density measurement; Force measurement; Low-frequency noise; Magnetic force microscopy; Magnetic forces; Magnetic heads; Magnetic noise; Noise level; Noise measurement; Perpendicular magnetic recording; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
