Micromagnetics studies of CoX/Pt media with interfacial anisotropy based on Voronoi polycrystalline structures

The CoX/Pt multilayer (X here represents the doping element to form grain boundary) is considered as the potential future medium owing to its high interfacial perpendicular anisotropy utilized in magnetic assisted magnetic recording (MAMR). Meanwhile, microwave assisted reversal in Co/ Pt and Co/Pd has been reported in experiments. The magnetic property and its writability of the CoX/Pt medium with various anisotropy energies K_u are simulated by micromagnetics. The CoX/Pt media are modeled with the Voronoi polycrystalline structure built on a regular mesh, as seen in Fig.1. A micromagnetic cell is 1nm×1nm, with 0.4 nm thickness in CoX layer. The magnetic parameters of the two phases inside crystal grains and at grain boundary are treated separately.