Abstract In magnetic recording the signal-to-noise ratio (SNR) is a good indicator for the quality of written bits. However, a priori it is not clear which parameters have the strongest influence on the SNR. In this work, we investigate the role of the Gilbert damping on the SNR. Grains consisting of FePt like hard magnetic material with two different grain sizes d = 5 nm and d = 7 nm are considered and simulations of heat-assisted magnetic recording (HAMR) are performed with the atomistic simulation program VAMPIRE. The simulations display that the SNR saturates for damping constants larger or equal than 0.1. Additionally, we can show that the Gilbert damping together with the bit length have a major effect on the SNR whereas other write head and material parameters only have a minor relevance on the SNR.

中文翻译：

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吉尔伯特阻尼对热辅助磁记录中信噪比的优越作用

摘要 在磁记录中，信噪比（SNR）是写入比特质量的一个很好的指标。然而，先验地不清楚哪些参数对 SNR 的影响最大。在这项工作中，我们研究了吉尔伯特阻尼对 SNR 的作用。考虑了由具有两种不同晶粒尺寸 d = 5 nm 和 d = 7 nm 的 FePt 类硬磁材料组成的晶粒，并使用原子模拟程序 VAMPIRE 执行热辅助磁记录 (HAMR) 的模拟。模拟显示 SNR 在阻尼常数大于或等于 0.1 时饱和。此外，我们可以证明吉尔伯特阻尼和位长对 SNR 有主要影响，而其他写入磁头和材料参数对 SNR 的相关性很小。