Abstract
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-transformed spectrum are considered to reflect the presence of magnetization irregularities. 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 nm thick media were 200 and 270 kFCI, respectively.
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