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NEW PARADIGMS IN MAGNETIC RECORDING

机译：磁记录的新范式

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摘要

The phenomenal increase in the storage capacity of magnetic hard disc drives (HDD) in recent decades has been fueled not only by clever improvements in the engineering of tiny devices but also by discovery, and advances in understanding, of fundamental physical phenomena associated with magnetism at the nanometer length scales [1'2] Over the past 55 years, the Areal Density (AD) has increased from kb/in~2, to Mb/in~2, to Gb/in~2, and recently to Tb/in~2. The nontrivial task of making the early induc-tive transducers smaller (aided by the advent of thin-film technology) had enabled Compound Annual Growth Rates (CAGR) of about 40% in the first 35 years. Subsequent increases in AD were largely due to funda-mental changes in the three main magnetic components of the hard drive: The recording media, the write element of the transducer and the read element of the transducer [3] These three components, which are the focus of this review, interact and govern an important characteristic of information storage and retrieval in the HDD, namely the magnetic signal-to-noise ratio (SNR). Improvements in non-magnetic component technologies, such as signal pro-cessing, spindle bearings, active transducer-to-media spacing control, servo mechanical control, and variable bit aspect ratio along the radial direction have also been cmcial to AD growth.
机译：近几十年来，磁性硬盘驱动器（HDD）的存储容量显着增加，不仅是由于对微型设备的工程学进行了明智的改进，而且还发现和理解了与磁场有关的基本物理现象，从而推动了这种发展。纳米长度尺度[1'2]在过去的55年中，地域密度（AD）从kb / in〜2，增加到Mb / in〜2，增加到Gb / in〜2，最近又增加到Tb / in 〜2。使早期的感应式换能器更小的艰巨任务（由于薄膜技术的出现）使前35年的复合年增长率（CAGR）达到了约40％。随后AD的增加主要归因于硬盘驱动器的三个主要磁性成分的根本变化：记录介质，换能器的写入元件和换能器的读取元件[3]。本文的重点是交互和管理HDD中信息存储和检索的重要特征，即磁信噪比（SNR）。非磁性组件技术的改进，例如信号处理，主轴轴承，主动换能器与介质的间距控制，伺服机械控制以及沿径向方向的可变位长宽比，也对AD的增长至关重要。

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