范德华力对磁头/硬盘薄膜气体润滑动态特性的影响  

Influence of Van Der Waals Force on Dynamic Character of Magnetic Head/Disk

作　　者：白少先[1] 彭旭东[1] 孟永钢[2] 温诗铸[2] 

机构地区：[1]浙江工业大学机电工程学院,浙江杭州310032 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《摩擦学学报》2008年第5期438-442,共5页Tribology

基　　金：国家重点基础研究发展计划资助项目(2003CB716205);国家自然科学基金资助项目(50575152);浙江工业大学科研启动基金项目

摘　　要：利用摄动法分析了纳米间隙下范德华力对磁头动态飞行特性的影响规律.结果表明,在飞行高度低于5 nm后,范德华力降低了磁头的承载能力和飞行高度,使飞行高度和俯仰气膜刚度降低,对侧翻气膜刚度没有明显影响.范德华力对磁头滑块飞高振幅的影响主要在于特征振动频率区间,因此,通过磁头设计提高磁头特征振动频率,可以减弱范德华力对飞高振幅的影响.When the spacing between the slider and the disk is smaller than 5 nm, the effect of van der Waals between the two solid surfaces cannot be ignored anymore. This effect on the dynamic characters of slider was investigated numerically with perturbation method. The loading capability decreased significantly under the influence of van der Waals force when flying height was below than 5 nm, which induced the decrease of flying height and rigidities in directions of flying height and pitch, but the roll rigidity had little change. The van der Waals force played an important role that the vibration amplitude increased greatly only when the perturbation frequency is close to that of the slider. So the effect of the van der Waals force on dynamic flying-height amplitude can be controlled by the means of increasing the slider characteristic frequency much higher to a value than that of the perturbation. Then more attention should be paid on the effect of van der Waals force on loading capability in slider design.

关 键 词：范德华力 磁头 气体润滑 动态特性 

分 类 号：O641.3[理学—物理化学] TP334[理学—化学]