Micromagnetic study of recording on ion-irradiated granular-patterned media

Micromagnetic simulations are used to study magnetic recording processes of ion-irradiated bit-patterned media. The media is composed of several hundred grains. It is assumed that the ion irradiation affects the magnetic anisotropy but keeps the magnetization unchanged. The recording simulations were performed using a fully integrated micromagnetic simulation package. The background region that is regarded to be irradiated triggers the magnetic switching of the bits. Thus some degree of intergrain exchange between bits and background is needed to reduce the write field. However, the intergrain exchange leads to spin waves. It is found that the spin waves may cause adjacent tracks erasure.