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Repeatable and Non-repeatable FH Modulation Study Near Head Contact

机译：头部接触附近的可重复和不可重复的FH调制研究

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The lower head–media spacing (HMS) is always expected for achieving better recoding performance at high linear density. Besides the efforts to reduce the overcoat thickness of head and media, the low flying height (FH) and smaller FH modulation (FHM) are necessary to ensure the low HMS and good interface reliability. In the current HDD, the FH change is measured from the readback signal by the Wallace spacing loss equation. The real-time dynamic FH signals consist of repeatable and non-repeatable FH changes, or FHM. The repeatable FHM (RFHM) correlates with the disk morphology variations. It usually has the variation of transition parameter inside. Because the change of is the noise of the RFHM, it has to be very careful for the compensation of the RFHM by thermal FH control. Otherwise, it may cause unexpected head–disk contact. The non-RFHM (NRFHM) measurement is able to remove the media-related noise, which has a good testing accuracy of around 1 Å. This paper studies both RFHM and NRFHM characteristics of four types of sliders with different air-bearing surface designs.
机译：始终希望有较低的磁头-介质间距（HMS），以便在高线性密度下获得更好的记录性能。除了努力减少打印头和介质的保护层厚度外，还需要低飞行高度（FH）和较小的FH调制（FHM），以确保低HMS和良好的界面可靠性。在当前的硬盘驱动器中，FH变化是根据华莱士间隔损耗公式根据回读信号测得的。实时动态FH信号由可重复和不可重复的FH变化或FHM组成。可重复的FHM（RFHM）与磁盘形态变化相关。它通常在内部具有过渡参数的变化。因为变化是RFHM的噪声，所以必须非常小心地通过热FH控制来补偿RFHM。否则，可能会导致意外的磁头磁盘接触。非RFHM（NRFHM）测量能够消除与介质有关的噪声，该噪声具有约1Å的良好测试精度。本文研究了具有不同气浮表面设计的四种类型滑块的RFHM和NRFHM特性。

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