Magnetization reversal in enclosed composite pattern media structure

The bit patterned media use one single domain magnetic island to record a bit. It can effectively push the superparamagnetic limit to higher recording densities. In this paper, we present and investigate a composite patterned media structure comprising of soft layer enclosed magnetic islands to significantly improve the writing capability of conventional writer. Systematic micromagnetic simulation studies reveal that the proposed structure has a different domain wall propagation mechanism and has less stringent requirement on the exchange-coupling strength as compared to conventional composite structures.