Thin film gas lubrication characteristics of flying head slider bearings over patterned media in hard disk drives
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This paper describes the effects of moving patterned disk surfaces on thin film gas lubrication characteristics for flying head slider bearings in magnetic hard disk drives. In order to perform the most realistic simulation of slider flying characteristics over the patterned disk surfaces, we use the direct numerical simulation method, instead of using various averaging techniques. Therefore, a deterministic description of the bump pattern is adopted in this study. Dynamic analysis of the slider responses can be carried out, solving the air bearing equation based on the linearized Boltzmann equation with the equations of motion of the slider under the excitation of the moving pattern simultaneously. The slider's dynamic responses to moving spaced bumps disk surfaces are computed systematically and basic slider dynamics over patterned disk surfaces is clarified. The effects of the pitch of the bump pattern in the circumferential and radial directions on the slider spacing dynamic modulations as well as the slider static flying characteristics are studied in detail. Furthermore, the design optimizations for flying head slider bearings as well as the bump pattern, which minimize not only the slider static flying height increase but also spacing dynamic modulations, are discussed in order to achieve ultra-high density proximity magnetic recording.
KeywordsDirect Numerical Simulation Disk Surface Hard Disk Drive Numerical Simulation Method Linearize Boltzmann Equation
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