Magnetic erasures due to impact induced interfacial heating and magnetostriction

Citation
M. Suk et al., Magnetic erasures due to impact induced interfacial heating and magnetostriction, J TRIBOL, 122(1), 2000, pp. 264-268
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
ISSN journal
0742-4787 → ACNP
Volume
122
Issue
1
Year of publication
2000
Pages
264 - 268
Database
ISI
SICI code
0742-4787(200001)122:1<264:MEDTII>2.0.ZU;2-B
Abstract
High-velocity intermittent contacts between a slider and a disk may lead to data erasure dice to interfacial heating and high-speed mechanical contact stresses. These potential modes of erasure are investigated by artificiall y introducing high contact stresses that are nor likely to be observed in d isk drives. Nevertheless, the mechanisms of erasure are delineated in this study with little ambiguity by comparing the results from three different s ubstrate materials, namely Al-Mg, glass, and Si. We show that written flux patterns can be erased if either the substrate material has low thermal con ductivity or if the magnetic layer is damaged. We conclude that if the disk is not plastically damaged by high-speed contacts, then the magnetostricti on effect or stress-induced erasure is insignificant. In this case, the dom inant factor in erasure is a rise in the interfacial temperature, which is exacerbated by low thermal conductivity of the substrate.