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TECHNICAL PAPERS

Magnetic Erasures Due to Impact Induced Interfacial Heating and Magnetostriction

[+] Author and Article Information
M. Suk, P. Dennig, D. Gillis

International Business Machines, Storage Systems Division, San Jose, CA 95193 suk@technologist.com

J. Tribol 122(1), 264-268 (May 11, 1999) (5 pages) doi:10.1115/1.555352 History: Received November 10, 1998; Revised May 11, 1999
Copyright © 2000 by ASME
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References

Hsai,  Y.-T., Rottmayer,  R., and Donovan,  M. J., 1996, “A New Wear Measurement Technique for Psuedo-Contact Magnetic Recording Heads,” IEEE Trans. Magn., 32, No. 5, Sept., pp. 3750–3752.
Schreck,  E., 1994, “Magnetic-Readback-Mapping and its Application to Slider/Disk Interface Damage due to Shock Impact,” Tribol. Mech. Magn. Storage Systems, IX, pp. 5–10.
Mauri,  D., Speriosu,  V. S., Yogi,  T., Castillo,  G., and Peterson,  D. T., 1990, “Magnetoelastic Properties of Very Thin Co-Alloy Films,” IEEE Trans. Magn., 26, No. 5, Nov., pp. 1584–1586.
Jeong,  T. G., and Bogy,  D. B., 1993, “Dynamic Loading Impact Induced Demagnetization in Thin Film Media,” IEEE Trans. Magn., 29, No. 6, Nov., pp. 3903–3905.
Bowden, F. P., and Tabor, D., 1964, The Friction and Lubrication of Solids, Oxford University Press, Oxford, England.
Archard,  J. F., 1958/59, “The Temperature of Rubbing Surfaces,” Wear, 2, pp. 438–455.
Bhushan, B., 1990, Tribology and Mechanics of Magnetic Storage Devices, Springer-Verlag, New York, NY.
Suzuki,  S., and Kennedy,  F., 1989, “Measurement of Flash Temperature and Contact Between Slider and Magnetic Recording Disk,” IEEE Trans. Magn., 25, No. 5, Sept., pp. 3728–3730.
Suk,  M., and Jen,  D., 1998, “Potential Data Loss Due to Head/Disk Contacts During Dynamic Load/Unload,” IEEE Trans. Magn., 34, No. 4, July, pp. 1711–1713.
Timoshenko, S. P., and Goodier, J. N., 1970, Theory of Elasticity, McGraw-Hill, New York, NY, pp. 409–425.
Holman, J. P., 1981, Heat Transfer, McGraw Hill, New York, NY, 5th ed., p. 116.

Figures

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General layout of the tester used in the experiment
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Readback signal after dropping a ball from 1 mm in height on an Al-Mg disk with the disk speed of 34 m/s
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Readback signal after rewrite over the center erased track shown in Fig. 2
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Readback signal after dropping a ball from 2 mm in height on an Al-Mg disk with disk speed of 34 m/s  
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Readback signal after rewrite over the center erased track shown in Fig. 4
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(a) MFM map and section line across the damaged area shown in Fig. 4. (b) Section line across adjacent to the damaged area.
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Readback signal after dropping a ball from 5.3 mm high on a glass disk with disk speed of 34 m/s
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Contour plot of readback signal shown in Fig. 7
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Readback signal after rewrite over the center erased track shown in Fig. 7
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Drop height versus disk linear speed and their effect on erasure on glass disks
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(a) Hot probe set at 315°C and moved across a glass disk. (b) Hot probe temperature set at 420°C.
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Hot probe set at 420°C and moved across an Al-Mg disk

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