High speed magnetisation reversal in heat-assisted magnetic recording

Abstract

Calculations of switching times as a function of temperature and damping constant are discussed. Near to the Curie temperature, the switching time can be much shorter than at room temperature and independent of Ku. Simulations of heat-assisted magnetic recording were used to study the effect of heat and magnetic field pulse durations on the size and sharpness of bits written on various media. In media with small damping constants, the transition width was hardly influenced by the heat pulse duration, whereas, in media with higher damping constants, the transition width increased with the heat pulse duration.