MAGNETIZATION STRUCTURES OF COCR-ALLOY PERPENDICULAR MAGNETIC RECORDING MEDIA

Recorded magnetization structures of CoCrPtTa perpendicular media are observed by magnetic-force microscopy (MFM). Quantitative analysis of microscopic magnetization is carried out through spectrum analyses of MFM images. MFM signal intensity dependence on wavelength is obtained through Fourier transformation. Several peaks in the Fourier-transform ed spectrum are considered to reflect the presence of magnetization ir regularities. Average size of the magnetization irregularity decreases with decreasing the magnetic layer thickness. The 50% roll-off linear densities of MFM signal intensity measured for 25 and 100 run thick m edia were 200 and 270 kFCI, respectively.