Influence of Van der Waals Force on the Ultra-thin Gas Lubrication of Magnetic Head/Disk

Current thickness of the gas film in air bearing of Magnetic head/disk is only 8 nm.At such a small spacing,it is expected reasonably that the surface force will come into action.Numerical analysis was conducted to explore the possibility of Van der Waals force on magnetic head/disk.The numerical results show that Van der Waals force reduces the loading force of wedge-type slide block and double-track magnetic head,especially when the minimum spacing is below 6nm.Having the same dimension,the influence of Van der Waals force on double-track magnetic head is smaller than wedge-type slide block's. It is expected reasonably that the influence of Van der Waals is critical to magnetic head/disk,which is important for design and assembling of magnetic head.