Development of the dynamic simulation system for contact-type magnetic heads based on molecular gas/liquid film lubrication (MGL/MLL)

在这一年中，计划并执行了三项研究；1)为了理解考虑分子气膜润滑（MGL）和分子液膜润滑（MLL）效应的近接触头特性，利用长波理论计算了液体在线气压或滑块轴承引起的压力下的表面变形，该理论给出了考虑表面张力和范德华力的极薄膜层的随时间变形；2)建立了范德华力的广义公式，该公式可应用于HDI问题等一般问题，分析了飞头滑块的静、动态特性，包括范德华力；3)液体半月板桥的动态特性，揭示了高速摄像机观测到的接触角和液体曲率随时间的变化特征；在边界位置时变（VBP模型）和接触角时变（VCA模型）的假设下进行了分析，实验结果显示VBP模型和VCA模型的分析结果有一定的趋势性。

In this year, three research are planned and executed; 1) for the understanding of the near contact head characteristics considering both Molecular Gas-film Lubrication (MGL) and Molecular Liquid-film Lubrication (MLL) effects, surface deformations of the liquid under line air pressure or pressures caused by slider bearings were calculated using long-wave theory, which gives time-dependent deformations of very thin film layer considering surface tension and van der Waals forces, 2) the generalized formula of the van der Waals force was newly developed which can be applied to the general problems such as the HDI problems, and static and dynamic characteristics of the flying head sliders were analyzed including the van der Waals forces, 3) dynamic characteristics of liquid meniscus bridge, which shows the time dependent characteristics of contact angle and liquid curvatures observed by means of high speed video camera, were analyzed based on the assumption that i) the boundary positions are time-variable (VBP model) and ii) the contact angles are time-variable (VCA model), and the experimental results showed the tendency between analytical results of VBP model and VCA model.