Mossbauer effect study of surface magnetization processes in iron

Magnetization processes at the surface of iron plates were investigated in a variable external field by means of Mössbauer emission and scattering spectroscopy of⁵⁷Fe. It is shown that the 90? walls of closure domains do not move until an externally applied field reaches a certain value. The “starting” values of the field determined from the Mössbauer measurements agree with those at which a sudden decrease in the growth rate of the bulk magnetization starts. Blocking of the surface domain wall movement occurs in a layer of at least 10 Μm thickness.