Baoxi Xu; Hongtao Wang; Zhanhong Cen; Zhejie Liu, "4–5 Tb/in ^{{{2}}} Heat-Assisted Magnetic Recording by Short-Pulse Laser Heating," in Magnetics, IEEE Transactions on , vol.51, no.6, pp.1-5, June 2015 doi: 10.1109/TMAG.2014.2383355
Abstract:
Due to poor thermal performance of media, it is difficult for the heat assisted magnetic recording (HAMR) to achieve densities greater than 3 Tb/in2 for continuous wave laser heating. Short pulse laser heating is an attractive approach to improve the thermal response of media. In this paper, the recording performances of HAMR using short pulse laser heating are studied by dynamic micro-magnetic simulations solving Landau-Lifshitz-Bloch equation. The results show that the magnetic damping constant of media, and the applied magnetic field, H exhibit significant effects on recording quality at pulse width of 100ps. From analyses of the relationships among readout signal and noise ratio, recorded track width, and H, the required parameter setting for various recording densities are obtained. It is indicated that with a transducer tip size of 15 nm and heating laser pulse width of 100ps, the recording density great than 4 Tb/in2 is achievable for FePt recording media.
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