Simulation Study of Switching Field and Its Applied Field Angle Dependence of Three-layer Exchange Coupled Composite Dots

Abstract

Proposed exchange coupled composite (ECC) magnetic dot structure consisting of three layers was studied by simulation for practical design of the magnetic recording media. Induced perpendicular anisotropy due to the layer stacking as well as the shape anisotropy of the soft layer for a square prism ECC dot was estimated. The ECC dots with the modified perpendicular anisotropy fields for the layers exhibited a minimum switching field and a flat applied field angle dependence of the switching field near perpendicular direction as expected. This would contribute to decrease write track width or increase cross track shift margin. It is concluded that consideration of the shape and layer stacking perpendicular anisotropy is indispensable for designing practical ECC dots.