Flying Characteristics on Discrete Track and Bit-Patterned Media With a Thermal Protrusion Slider
Flying Characteristics on Discrete Track and Bit-Patterned Media With a Thermal Protrusion Slider
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使用热凸滑块在离散轨道和位模式介质上的飞行特性
DOI：
10.1109/tmag.2008.2002613
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发表时间：
2008
影响因子：
2.1
通讯作者：
Dan Kercher
中科院分区：
文献类型：
--
作者：
Bernhard E. Knigge;Z. Bandic;Dan Kercher
未来的磁盘驱动器可能具有离散化的磁道或位模式，以提高热稳定性和更高的面密度。这影响了表面形貌，导致目前使用的空气轴承滑块的不同飞行特性。实际的飞行高度下降与图案密度和图案深度的关系尚未测量。不过，最近已经模拟出来了。我们已经制作了具有各种形貌的角截面的可飞行图案盘。这允许在一次旋转中在盘的不同部分中测量飞行高度调制和间隙下降。使用脉冲热突出测量滑块到磁盘间隙的变化。此外，我们研究了滑块动力学和磁盘润滑剂的变化，从一个平坦的区域过渡到一个图案化的区域。这是相关的，因为伺服扇区与盘上的数据区相比具有不同的模式，导致动态激励和飞行高度调制。即使在磁盘平面化之后，这些效应仍然可以被检测到，因为它们是周期性的，并且可以激发空气轴承共振。根据我们的实验观察，我们已经建立了一个经验方程，预测滑块间隙损失与图案密度。当滑块空气轴承从大尺度图案（以微米为单位）过渡到小尺度图案（以纳米为单位）时测量间隙变化，这表明随着壁/孔数量的增加而增加的升力-即使在类似的标称图案密度下。功能性驱动器被构建为包含具有压印伺服扇区的离散轨道介质。
Future disk drives may have discretized tracks or bit patterns for increased thermal stability and higher areal density. This affects the surface topography, resulting in different flying characteristics of the currently used air bearing slider. The actual flying height drop versus the pattern density and pattern depth has not been measured yet. However, it has been recently simulated. We have made flyable patterned disks with angular sections having various topographies. This allowed the measurement of flying height modulation and clearance drop within one revolution in different sections of the disks. Slider-to-disk clearance changes were measured using pulsed thermal protrusion. Furthermore, we investigated the slider dynamics and disk-lubricant changes during the transition from a flat zone to a patterned zone. This is of relevance since the servo sectors have different patterns compared to data zones on the disk leading to dynamic excitations and flying height modulation. These effects may still be detectable even after disk planarization since they are periodic and may excite the air bearing resonance. Based on our experimental observation, we have established an empirical equation that predicts slider clearance loss versus pattern density. The clearance change was measured when the slider air bearing was transitioning from a large scale pattern (in micrometers) to a small scale pattern (in nanometers), indicating increased lift with an increased number of walls/holes-even at a similar nominal pattern density. Functional drives were built that contained discrete track media with imprinted servo sectors.