Dynamic adhesive instability of sub-five nanometer head-disk interfaces
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abstract
Understanding of dynamic adhesive, contact and friction interactions and associated instabilities at magnetic storage head-disk interfaces (HDIs) is critical as the physical distance between the recording slider and the high-speed rotating disk decreases to sub-five nanometers to achieve 155 Gbit/cm2 (1 Tbit/in2) recording densities. In this study, a two degree-of-freedom nonlinear dynamic model that includes realistic roughness, adhesion, friction and the dynamics of a flying and contacting HDI was developed to characterize a fully flying (6.8 nm) and a pseudo-contacting (3 nm) HDI utilizing different air-bearing designs. The effect of roughness on the slider flying performance and stability was also investigated through a comparison to a simple two flat parallel surface counterpart. The simulation results revealed that while adhesion has little influence in a fully flying interface when flying heights are above 5 nm, it leads to prolonged contact, higher bouncing vibrations and unstable slider behavior for 3 nm flying height. At such low nominal flying height, the inclusion of the electrostatic force also exacerbates HDI unstable behavior. 2005 IEEE.
name of conference
Proceedings of the 2005 IEEE International Symposium on, Mediterrean Conference on Control and Automation Intelligent Control, 2005.
