Micromagnetic study of switching speed in perpendicular recording media

Switching speed in perpendicular recording media has been studied from micr omagnetic simulations, by applying a uniform reversal field to an array of magnetic grains. Increasing the damping constant reduces the switching time , but a weak exchange interaction leads to an increase in the switching tim e. A linear relationship is found between the switching time and the head f ield rise time for different field strengths, damping constants and weak ex changes. A 20 degrees field angle to the perpendicular direction substantia lly improves the switching speed.