Optimisation of dual structure recording media for microwave-assisted magnetic recording

Abstract

Dual structure recording media with a “notched” anisotropy configuration were optimised for use in a microwave-assisted magnetic recording system. First of all the effective head field gradient was maximised by tuning the anisotropy of the layers in each structure. Next, intergranular and interlayer exchange coupling was adjusted to maximise the signal to noise ratio of written tracks. A grain switching probability model was trained and used to generate written bit sequences for read bit error rate calculations. For two structures with different ferromagnetic resonance frequencies the total amount of user data that could be stored on the two structures was estimated to be 2.98 Tbit/in2.