纳米高度工作磁头的稀薄区域与稀薄效应分析

利用考虑稀薄气体效应修正的Reynolds方程对飞高在10nm附近的负压磁头的稀薄区域进行了数值计算.根据计算结果对其所处的稀薄区域和稀薄效应对磁头飞行性能的影响进行了分析和讨论.分析结果表明:磁头工作在滑流区和过渡区,并随着速度增加明显向过渡区移动;稀薄气体效应最大处不是发生在飞高最薄的尾部,而是发生在飞高较薄、压力较低的边缘区;考虑稀薄效应对载荷和最大压力有所降低,而对最小压力的影响较小.

Analysis of Rarefied Regions and Rarefied Effects of a Nano-Scale Magnetic Head

In the present paper,the modified Reynolds equation considering rarefied gas effect is used to calculate the rarefied region of a negative magnetic head working in the distance of 10nm away.According to the calculated results,discussions and analyses are then presented to reveal the effects of rarefied region and rarefied effect on the working performances of the magnetic head.The results show that(1) the magnetic head works in the slip-flow and transition regions and moves to the transition region with the increase in velocity;(2) the maximum rarefied effect does not occur in the minimum flying height on the rear but at the side edges where the flying height is thinner and the pressure is lower;and(3) if the rarefied effect is considered,the load-carrying capacity of the magnetic head and the maximum pressure decrease,while the minimum pressure slightly changes.