Yosuke Kajihara

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New methods for real-time observation of molecularly thin lubricant on magnetic disks are discussed. Here, two types of ellipsometric microscopes are considered. One is vertical-objective setup with off-axis Kohler illumination type and another one is two-stage imaging type. Both can provide 0.1-μm-order lateral resolution and 0.1-nmorder thickness(More)
A two-stage-imaging ellipsometric-contrast microscope (TIEM) has been developed to measure the distribution of film thickness over a wide area of molecularly thin liquid films with a high lateral resolution, wide field of view, high thickness resolution, and high-speed. Moreover, this ellipsometric microscope enables us to achieve simultaneous measurements(More)
Methods based on ellipsometric microscopy were discussed for real-time observation of molecularly thin lubricant on magnetic disks and vertical-objective ellipsometric microscopy was applied to the observation of dewetting of the lubricant. The observation revealed that the dewetting patterns in the early stage are strongly correlated with the signs of(More)
A two-stage imaging ellipsometric microscopy with high lateral resolution and a wide field of view has been developed that will enable real-time visualization of the dynamic behavior of the nanometer-thick lubricant film used in head-disk interfaces incorporating contact or intermittent contact recording technology when it is sheared by the head. The first(More)
The vertical-objective-based ellipsometric microscope (VEM) is presented which can be used for real-time visualization of nm-thick lubricant films with high lateral resolution. The performance of hard disk drives (HDDs) depends on the dynamics of the nm-thick liquid lubricant films due to decrease of head-disk gap to 2 to 3 nm. The contact or near-contact(More)
The shearing deformation of the lubricant film was measured by using two-stage imaging ellipsometric microscope (TIEM) combined with an optical-fiber-based friction force measurement method. The TIEM enables high-lateral-resolution and real-time measurements of the thickness distribution of the nanometer-thick lubricant films during shearing. By adding a(More)
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