Title: Design optimisation of sub-5 nm Head-Disk Interfaces using a two-degree-of-freedom dynamic contact model with friction

Authors: Andreas A. Polycarpou, Allison Y. Suh

Addresses: Department of Mechanical Science and Engineering, University of Illinois at Urbana-Campaign, Urbana, IL, USA. ' Department of Mechanical Science and Engineering, currently with Seagate Technology, LLC, MN, University of Illinois at Urbana-Campaign, Urbana, IL, USA

Abstract: The realisation of Tbit/in² areal densities will depend on the successful Head-Disk Interface (HDI) designs that will result in the smallest possible head media spacing. In this study, the effect of HDI roughness on flying/contact dynamics of sub-5 nm HDIs was investigated. Rough surface interfacial and dynamic contact models were used to predict time varying slider motion, from which output responses were generated through regression modelling. Provided that the input disk dynamic microwaviness is low, one could design the interface to have low roughness and area for fully flying or high roughness and area for mild, sustained contact and reduced Bouncing Vibrations (BVs).

Keywords: head-disk interface; HDI roughness; flying-height modulation; FHM; friction; adhesion; bouncing vibration; regression model; design optimisation; dynamic contact modelling; contact dynamics; slider motion; perpendicular recording technologies; recording areal density.

DOI: 10.1504/IJPD.2008.017464

International Journal of Product Development, 2008 Vol.5 No.3/4, pp.268 - 291

Published online: 11 Mar 2008 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article