Thermal stability of written bits in double-layered perpendicular recording media

Summary form only given. The thermal stability of written bits was compared between single- and double-layered perpendicular magnetic recording media using a micromagnetic simulation. The computation model for the single-layered media was the same as prepared previously by Uesaka et al. (1997). The model was extended to the case of double-layered media so that both the recording layer and underlayer can be treated micromagnetically. The thermal stability was evaluated by the signal decay time caused by thermal fluctuation starting with an ideal recorded state as the initial magnetization state.