Molecularly thin lubricant films are used for the lubrication of head disk interfaces in hard disk drives. The film thickness is reduced\r\nto 1-2nm to minimize the magnetic spacing, and optimal, precise design is required to obtain sufficient lubrication.However, until\r\nnow, there was no generally applicable method for investigating such thin films. Therefore, we developed a highly sensitive shear\r\nforce measuring method and have applied it to the viscoelastic measurement of lubricant films coated on magnetic disk surfaces.\r\nIn this paper, we review the method and summarize the useful findings we have demonstrated so far.
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