High-velocity intermittent contacts between a slider and a disk may lead to data erasure due to interfacial heating and high-speed mechanical contact stresses. These potential modes of erasure are investigated by artificially introducing high contact stresses that are not likely to be observed in disk drives. Nevertheless, the mechanisms of erasure are delineated in this study with little ambiguity by comparing the results from three different substrate materials, namely Al-Mg, glass, and Si. We show that written flux patterns can be erased if either the substrate material has low thermal conductivity or if the magnetic layer is damaged. We conclude that if the disk is not plastically damaged by high-speed contacts, then the magnetostriction effect or stress-induced erasure is insignificant. In this case, the dominant factor in erasure is a rise in the interfacial temperature, which is exacerbated by low thermal conductivity of the substrate. [S0742-4787(00)03401-9]
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January 2000
Technical Papers
Magnetic Erasures Due to Impact Induced Interfacial Heating and Magnetostriction
M. Suk,
M. Suk
International Business Machines, Storage Systems Division, San Jose, CA 95193
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P. Dennig,
P. Dennig
International Business Machines, Storage Systems Division, San Jose, CA 95193
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D. Gillis
D. Gillis
International Business Machines, Storage Systems Division, San Jose, CA 95193
Search for other works by this author on:
M. Suk
International Business Machines, Storage Systems Division, San Jose, CA 95193
P. Dennig
International Business Machines, Storage Systems Division, San Jose, CA 95193
D. Gillis
International Business Machines, Storage Systems Division, San Jose, CA 95193
Contributed by the Tribology Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS and presented at the STLE/ASME Tribology Conference, Orlando, FL, October 10–13, 1999. Manuscript received by the Tribology Division November 10, 1998; revised manuscript received May 11, 1999. Paper No. 99-Trib-6. Associate Technical Editor: A. K. Menon.
J. Tribol. Jan 2000, 122(1): 264-268 (5 pages)
Published Online: May 11, 1999
Article history
Received:
November 10, 1998
Revised:
May 11, 1999
Citation
Suk , M., Dennig , P., and Gillis , D. (May 11, 1999). "Magnetic Erasures Due to Impact Induced Interfacial Heating and Magnetostriction ." ASME. J. Tribol. January 2000; 122(1): 264–268. https://doi.org/10.1115/1.555352
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