Numerical analysis of perpendicular magnetic printing for hard disks beyond 2 Tb/in2

A micromagnetic analysis of magnetic printing onto an exchange-coupled composite (ECC) media was performed with a data signal density of over 2 Tb/in2. Magnetic printing is a promising method of recording a servo signal onto an ECC media with data signal densities beyond 2 Tb/in2. The printing performance was close to 100% at servo signal densities of 1.0 and 1.7 Tb/in2. There was an optimum intergrain coupling strength in ECC media at each servo signal density, and as the servo signal density increased, the optimum intergrain coupling strength became weaker.