Magnetization Reversal and Magnetic Switching Volume in Electrodeposited CoPt Magnetic Films with Different Thickness

The thickness dependence of the magnetic switching volumes in electrodeposited CoPt films was investigated from the magnetization reversal and the magnetic interaction behavior. As the sample thickness is increased, the field difference between the wall pinning field (HDW) and the nucleation field (HN) as well as the absolute value of.area are increased. Therefore, the decrement tendency of the switching diameter with increasing sample thickness can be well explained by the domain wall motion controlled by the domain wall pinning and the strength of dipolar interaction.