Transition noise in nanobicrystalline thin film media

The impact of effective anisotropy field magnitude variation in nanobicrystalline film media on transition noise is investigated using micromagnetic modeling. It is found that a moderate variation of the anisotropy field magnitude in the film media yields a reduction of transition noise, especially at high recording densities. It is suggested that the variation of the intrinsic magnetic properties at grain level tends to suppress the transition noise enhancement due to the intergranular exchange coupling and the magnetostatic interaction in the films. However, such variation could also be adverse if the variation becomes either spatially correlated, or too large.