Areal density optimizations for heat-assisted-magnetic recording of high density bit-patterned media

Abstract

Heat-assisted-magnetic recording (HAMR) is hoped to be the future recording technique for high density storage devices. Nevertheless, there exist several realizations strategies. With a coarse-grained Landau-Lifshitz-Bloch (LLB) model we investigate in detail benefits and disadvantages of continuous and pulsed laser spot recording of shingled and conventional bit-patterned media. Additionally we compare single phase grains and bits having a bilayer structure with graded Curie temperature, consisting of a hard magnetic layer with high $T_{\mathrm{C}}$ and a soft magnetic one with low $T_{\mathrm{C}}$, respectively. To describe the whole write process as realistic as possible a distribution of the grain sizes and Curie temperatures, a displacement jitter of the head and the bit positions are considered. For all these cases we calculate bit error rates of various grain patterns, temperatures and write head positions to optimize the achievable areal storage density. Within our analysis shingled HAMR with a continuous laser pulse moving over the medium reaches the best results, and thus having the highest potential to become the next generation storage device.

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Cited by in corpus (13)

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• Basic noise mechanisms of heat-assisted-magnetic recording
• Models of Advance Recording Systems: A Multi-timescale Micromagnetic code for granular thin film magnetic recording systems
• Thermal fluctuations in antiferromagnetic nanostructures
• AC noise reduction based on exchange coupled grains for heat-assisted-magnetic recording: The effect of an FeRh interlayer
• Noise reduction in heat-assisted magnetic recording by optimizing a high/low Tc bilayer structure
• Influence of grain size and exchange interaction on the LLB modeling procedure
• Systematic parameterization of heat-assisted magnetic recording switching probabilities and the consequences for the resulting SNR
• Efficiently reducing transition curvature in heat-assisted magnetic recording with state-of-the-art write heads
• Improving the Signal-to-noise Ratio for Heat-Assisted Magnetic Recording by Optimizing a High/Low Tc bilayer structure
• Curie temperature modulated structure to improve the performance in heat-assisted magnetic recording
• The superior role of the Gilbert damping on the signal-to-noise ratio in heat-assisted magnetic recording