Micromagnetic Simulation of 1-FePt-Based Exchange-Coupled-Composite-Bit-Patterned Media with Microwave-Assisted Magnetic Recording at Ultrahigh Areal Density.

In this work, we propose exchange-coupled-composite-bit-patterned media (ECC-BPM) with microwave-assisted magnetic recording (MAMR) to improve the writability of the magnetic media at a 4 Tb/in recording density. The suitable values of the applied microwave field's frequency and the exchange coupling between magnetic dots, , of the proposed media were evaluated. It was found that the magnitude of the switching field, , of the bilayer ECC-BPM is significantly lower than that of a conventional BPM.