Switching of a particle in inhomogeneous applied field

► We investigated switching of a particle in inhomogeneous applied field. ► The average switching field changes with the change in the field gradient. ► The average switching field changes with the region of the applied field. ► The average switching field is also determined from normalized particle size d/A/Ku. ► Large FG is not necessarily important in a write head for BPM as long as the head field changes within one particle in the medium.