Fumio Izawa

Self‐consistent calculation of stress‐induced demagnetization process

The change in a magnetization transition zone in a magnetic recording medium is analyzed under stress application by the self‐consistent iterative calculation method. The medium is assumed to be composed of uniaxial single domain magnetic particles with two‐dimensional angular distribution of easy axes. Owing to the applied stress, the demagnetizing field temporarily increases at the localized area, because the magnetization distribution changes due to stress‐induced easy axes rotation. The applied stress also changes the critical field for irreversible magnetization switching; hence, additional magnetization reversal takes place for particles which suffer critically large demagnetizing field. Consequently, the present simulation can explain the stress‐induced demagnetization phenomenon, in which reproduced signal level attenuates as a result of magnetization transition broadening caused by stress.