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.
Highlights
Microwave-assisted magnetic recording (MAMR) is an energyassisted recording technology that has the potential to allow selective recording on media with multiple, discrete recording structures.Earlier work described a medium with two recording structures.1 A spin torque oscillator (STO) was used to select the structure on which to write
The average grain size in the recording medium was reduced from 8 nm to 6 nm and the average grain pitch reduced from 9 nm to 7 nm
Transition jitter decreases as the head field gradient increases, and in order to write clear, distinct bits at the highest possible linear densities the head field gradient should be maximised
Summary
Microwave-assisted magnetic recording (MAMR) is an energyassisted recording technology that has the potential to allow selective recording on media with multiple, discrete recording structures. Earlier work described a medium with two recording structures.. A spin torque oscillator (STO) was used to select the structure on which to write. In this work we discuss further improvements to the recording structures and write head that allow for higher density storage. Compared with the earlier work, the spacing between the write head ABS and the SUL was reduced from 25 nm to 20 nm and a new write head design was used. The average grain size in the recording medium was reduced from 8 nm to 6 nm and the average grain pitch reduced from 9 nm to 7 nm. The number of magnetic materials forming each recording structure was increased from two to three to allow for further optimisation
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