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Tribological Performance of Head-Disk Interface Due to Nanoasperity Impacts



Tze J. Chuang, Stephen M. Hsu


During the track accessing mode ofa hard disk drive, theflying height of the slider over thedisk surface becomes smaller and smaller as the demand in data storage density increases. As aresult, the propensity of glide avalanche is bound to increase when the trailing edge of the slidertouches a surface ridge of the high speed rotating disk. A 3Dfinite element model is constructed tosimulate the local impact and its aftermath. For a given design of the disk structure with knownelasticlplastic properties as well as the slider's design with its surface texture, the model predictsmaximum contact zoi7e size, penetration depth andforce, contact duration, time-history of energytransfer and its partition and substrate stress field for a given impacting velocity (includingimpacting angle and magnitude). Solutions of output variables such as penetration, contactforces,energy transfer and damage are presented asfuiictions of input such as velocity, asperity size, filmthickness, mediaproperties. It wasfound that the sliding contacts can be characterized as harmonicmotion withfixed displacement conditions in mechanics terms. Most predictions can be interpretedalong this line. These results should be useful and can be consulted as a design guide by themagnetic hard disk manufacturers.
IEEE Transactions on Magnetics


computer hard disk, dynamic analysis, energy transfer, finite element method, layered structure, nanomechanics modeling, residual stress, stress analysis


Chuang, T. and Hsu, S. (2021), Tribological Performance of Head-Disk Interface Due to Nanoasperity Impacts, IEEE Transactions on Magnetics (Accessed April 13, 2024)
Created October 12, 2021