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TECHNICAL PAPERS

Wear Analysis of Head-Disk Interface During Contact

[+] Author and Article Information
Wei Peng, James Kiely, Yiao-Tee Hsia

Mechanical Integration, Seagate Technology, 1251 Waterfront Place, Pittsburgh, PA 15222-4215

J. Tribol 127(1), 171-179 (Feb 07, 2005) (9 pages) doi:10.1115/1.1843832 History: Received April 01, 2004; Revised May 26, 2004; Online February 07, 2005
Copyright © 2005 by ASME
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References

Hsia, Y. T., and Donovan, M. J., 1996, “The Design and Tribology of Tripad Sliders for Pseudo-Contact Recording in Magnetic Hard Disk Drives,” Tribology of Contact/Near-Contact Recording for Ultra High Density: Magnetic Storage (Trib (Series), Vol. 6.), pp. 17–24.
Meng,  H. C., and Ludema,  K. C., 1995, “Wear Models and Predictive Equations: Their Form and Content,” Wear, 181, pp. 443–457.
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Kawakubo,  Y., Ishii,  M., Higashijima,  T., and Nagaiie,  S., 1997, “Running-in Effects on Thin-film Magnetic Disks,” J. Japan. Soc. Tribol., 42, pp. 807–812.
Kawakubo,  Y., Miyazaw,  S., Nagat,  K., and Kobatake,  S., 1996, “Carbon Overcoated Pin Wear Tests on Thin-Film Magnetic Disks,” Proc. Inter. Tribol. Conf., 95, pp. 1805–1810.
Berg,  J. L., 1993, “A Statistical Model of Surface Evolution,” Adv. Inf. Storage Syst., 5, pp. 283–295.
Hu,  Y., Jones,  P. M., Chang,  P. T., Bogy,  D. B., 1998, “Partial Contact Air Bearing Characteristics of Tripad Sliders for Proximity Recording,” ASME J. Tribol., 120, pp. 272–279.
O’Hara,  M. A., Hu,  Y., and Bogy,  D., 2000, “Optimization of Proximity Recording Air Bearing Sliders in Magnetic Hard Disk Drives,” ASME J. Tribol., 122, pp. 257–259.
Li,  Y., and Menon,  A., 1996, “A Model of Slider/Disk Interface Wear for Proximity Recording,” ASME J. Tribol., 118, pp. 813–818.
Bhushan B., 1996, Tribology and Mechanics of Magnetic Storage Devices, 2nd ed., Springer-Verlag, New York.
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Figures

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Schematics of (a) a two-dimensional model of interference between the head and disk, and (b) a slider with rectangular trailing edge in contact with a nominally flat rough disk
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Schematics of (a) contact and wear mechanisms between of a smooth slider and a nominally flat rough disk, (b) clean cut wear, and (c) mopping wear
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Probability density functions of surface asperity heights for virgin and worn disk
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Flowchart of the coupled head and disk wear
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Variation of head–disk interference height with time during HDI wear. kAb=1e-4,kp/r=1,v=2.5e7 μm/s,H=20 GPa,μ=0.25,a=5e2 μm,b=1e3 μm,c=2e3 μm,L=5e2 μm,ϕ0=1.7e-2,Kp=2e5 N/μm,Kz=0.5 N/μm,Kpf=4.5 e4 N/μm.
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Variation of slider wear volume and associated plastic contact ratio with time. kAb=1e-6,kAd=1e-8,σ=1 nm,β*=0.5 μm,v=2.5e7 μm/s,H=20 GPa,E*=110 GPa,Fc=1e-4N.
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Variation of slider wear volume and wear rate with time predicted by the CHAD wear model and various empirical running-in models: (a) Deterioration model and (b) running-in model
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Variation of HDI wear volume with time for (a) single track wear, (b) multiple track wear, and (c) an equivalent single track wear
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Optical image of a portion of the air bearing surface used in the study
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Measurements of head wear volume as a function of test duration
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Height distribution of AFM data from worn and unworn areas of the disk surface
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Topographical sections from the trailing edges of a series of heads flown on the same media track
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Average head wear rate as a function of cumulative media wear time

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