Maximum Likelihood Detection for 3-D-MAMR
Maximum Likelihood Detection for 3-D-MAMR
复制标题
3-D-MAMR 的最大似然检测
DOI：
10.1109/tmag.2019.2944800
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;R. Wood;S. Rahardja
三维磁记录是一种候选的下一代磁记录，其中使用多个记录层，每个层存储其自己的独立数据，这有可能扩展存储面密度，同时有几个挑战需要克服。在写入方面，一种建议是使用微波辅助磁记录，该磁记录利用来自自旋扭矩振荡器的场来激励堆叠中的特定层，以选择用于写入的特定层。回读也是一个挑战，因为标准读取器从多个层拾取叠加的信号。尽管各层之间存在高水平的干扰，但必须准确地恢复来自各层的数据。在这篇文章中，我们评估这种干扰的影响，并寻找方法来减轻它，实现多层记录的收益。我们进行了初步的研究，一对二进制通道的总和的能力，其次是一个模型的两层记录系统与较低的层具有较差的色散。我们的研究表明，引入第二层可能会带来一些净面密度增益，从而延长磁记录行业的寿命。
3-D magnetic recording is a candidate next-generation magnetic recording where multiple recording layers are used, each layer storing its own independent data, which has the potential to extend the storage areal density while having several challenges to overcome. On the writing side, one proposal is to use the microwave-assisted magnetic recording that energizes a particular layer in the stack with a field from a spin-torque oscillator to select a specific layer for writing. Readback is also a challenge as the standard reader picks up a superposition of signals from the multiple layers. The data from each layer have to be accurately recovered despite the high levels of interference between the layers. In this article, we assess the impact of such interference and look for ways to mitigate it to realize the gains of multilayer recording. We perform an initial study on the capacity of the summation of a pair of binary channels, followed by a model for a two-layer recording system with the lower layer having worse dispersion. Our study indicates the potential for some net areal-density gains from the introduction of the second layer that could lead to the increased longevity of the magnetic recording industry.