A study of magnetization fluctuations in transition region using MFM image analysis

This paper proposed a method for analysis of MFM (magnetic force microscopy) images. By using the proposed method, the influence of the magnetization fluctuations in transition regions can be analyzed. In the proposed method, the MFM images are processed as stochastic signals, and their stochastic parameters are obtained. The variance profile (the variance of MFM signals across the track direction), one of the parameters, is closely related to the magnetization fluctuations in the transition region. Therefore, by observation of the variance profile, the fluctuations can be quantitatively analyzed. An example of the analysis, which is based on the variance profile, is presented. From the analysis, it is found that the parameter L/W, which is introduced to characterize the variance profile, has the same trend as the S/N_m (N_m:medium noise) does