Abstract
To achieve an ultra-high storage capacity, heated-dot magnetic recording (HDMR) has been proposed, which heats a bit-patterned medium before recording data. Generally, an error during the HDMR writing process comes from several sources; however, we only investigate the effects of staggered island arrangement, island size fluctuation caused by imperfect fabrication, and main pole position fluctuation. Simulation results demonstrate that a writing error can be minimized by using a staggered array (hexagonal lattice) instead of a square array. Under the effect of main pole position fluctuation, the writing error is higher than the system without main pole position fluctuation. Finally, we found that the error percentage can drop below 10% when the island size is 8.5 nm and the standard deviation of the island size is 1 nm in the absence of main pole jitter.
Highlights
It has been known that a perpendicular magnetic recording technology used in current hard disk drives is approaching its super-paramagnetic limit at about 1 Tb/in[2] (Tera-bit per square inch).[1]
This paper investigates the effects of island arrangement (i.e., a regularly-patterned array and a hexagonal-patterned array), and island size and main pole fluctuations in the heated-dot magnetic recording (HDMR) system, where the micromagnetic simulation is employed based on the
This paper investigates an error resulted from a magnetization reversal in the 1st – 5th islands during the writing process
Summary
It has been known that a perpendicular magnetic recording technology used in current hard disk drives is approaching its super-paramagnetic limit at about 1 Tb/in[2] (Tera-bit per square inch).[1]. One of the main challenges is the island size fluctuation, which could cause a written-in error during the writing process. A directed self-assembly of nanoparticles has been interested because of large area patterning.[13,14,15,16,17] this technique still has some challenges such as controlling island size distribution, obtaining small island size, and fabricating perfect templates or masks.[18] Besides the island size fluctuation, the written-in error can be caused by bit island position jitter, main pole position fluctuation, heat spot position, and so forth. This paper investigates the effects of island arrangement (i.e., a regularly-patterned array (or square array) and a hexagonal-patterned array (or staggered array)), and island size and main pole fluctuations in the HDMR system, where the micromagnetic simulation is employed based on the. Landau-Lifshitz-Gilbert (LLG) equation and the thermal effect on BPM is evaluated by the Brillouin function
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