FePt L10/A1 graded media with a rough interphase boundary

Abstract

A graded media consisting of FePt L10 (hard) and A1(soft) phases separated by a rough wedge-shaped interphase boundary, the "phase graded media" is suggested. The rough interface helps domain wall propagation from the soft to the hard phase, owing to the easily reversed wedge tips of the hard phase. The reversed domain expands in the hard phase with a small additional field. As a result, the switching field of the phase graded media was reduced to 13 kOe which is 16% of FePt L10 single phase (79 kOe), the reduction is comparable with the stacked graded media. © 2011 American Institute of Physics.