Baoxi Xu; Hongtao Wang; Zhanhong Cen; Zhejie Liu; Jianming Li; Toh, Y.T.; Kaidong Ye; Jing Zhang; Hongzhi Yang, "Analysis of Heat-Assisted Magnetic Recording to Density of 4 Tb/in ^{text\bf {2}} ," in Magnetics, IEEE Transactions on , vol.50, no.11, pp.1-4, Nov. 2014 doi: 10.1109/TMAG.2014.2320270
Abstract:
Thermal performance of media is a key factor limiting heat assisted magnetic recording density. In this paper, the effects of near field optical transducer tip size on the thermal profiles of media are studied and results show that even with tip size of 10 nm, the obtained cross track thermal spot size and down track thermal gradient still cannot meet the requirements of 4 Tb/in2 for continuous wave laser heating. Pulse laser heating can improve the thermal distribution significantly and the requirements for 4 Tb/in2 can be met at pulse width of 100ps. Dynamic micromagnetic recording simulation with Landau-Lifshitz-Bloch (LLB) equation is conducted for pulse laser heating recording. The results indicate that 4 Tb/in2 density is realizable for FePt recording media. It is also pointed out that, for short pulse laser heating recording, media with large magnetic damping constant is important.
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