Optimization of the 3-D-MAMR Media Stack
Optimization of the 3-D-MAMR Media Stack
复制标题
3-D-MAMR 媒体堆栈的优化
DOI：
10.1109/tmag.2019.2916748
复制
发表时间：
2019
影响因子：
2.1
通讯作者：
S. Rahardja
中科院分区：
文献类型：
--
作者：
K. Chan;S. Greaves;S. Rahardja
微波辅助磁记录（MAMR）是一种先进的磁记录方案，有望在传统垂直磁记录（PMR）的基础上扩展面密度。这是通过在写入过程中引入高频（HF）振荡磁场来实现的，从而减少了磁头切换晶粒所需的写入场。因此，具有较大各向异性、较大热稳定性和较小晶粒尺寸的晶粒可以用于介质中。3-D- mamr利用相同的原理，不仅辅助写入，而且在多层介质堆栈中选择特定层进行写入，从而实现3-D磁记录。由于涉及大量变量和记录层之间的相互作用，三维mamr系统的优化变得复杂。在多层堆栈中的另一层上进行某种程度的不必要的写入通常很难在目标层上进行写入。在本文中，我们使用响应面方法（RSM）对三维mamr媒体堆栈进行优化，这是一种用于实验设计（do）的方法。这导致了一种目标层的信噪比（SNR）性能和另一层的写入错误数共同优化的媒体设计。
Microwave-assisted magnetic recording (MAMR) is an advanced magnetic recording scheme that is expected to extend the areal density beyond that achieved by conventional perpendicular magnetic recording (PMR). This is done by introducing a high-frequency (HF) oscillating magnetic field during the writing, reducing the write field from the head needed to switch the grains. Grains with larger anisotropy, greater thermal stability, and reduced grain size can thereby be used in the media. 3-D-MAMR uses this same principle not only to assist the writing but also to select a particular layer in a multi-layer medium stack for writing, thereby realizing 3-D magnetic recording. Optimization of a 3-D-MAMR system is complicated by the large number of variables involved and interactions between the recording layers. It is generally difficult to write on a target layer without some degree of unwanted writing on a different layer in a multi-layer stack. In this paper, we perform an optimization of a 3-D-MAMR media stack using the response-surface methodology (RSM), a method used in the design of experiments (DoEs). This results in a media design in which the signal-to-noise ratio (SNR) performance in the target layer and the number of written errors in the other layer are jointly optimized.