Slider-Disk Impact and Impact Induced Data Erasure in High Density Magnetic Recording Systems

Yi-Jun MAN
Zhi-Min YUAN

IEICE TRANSACTIONS on Electronics   Vol.E83-C    No.9    pp.1539-1545
Publication Date: 2000/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Selected Papers from the 4th Asian Symposium for Information Storage Technology)
data erasure,  head-disk interface,  tribology,  magnetic recording,  magnetic disk drive,  

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Future high density magnetic recording requires a nanometer spaced head-slider interface, high track seeking velocity and high spindle speed. Such a combination greatly increases the likelihood of slider-disk and slider-particle-disk impact. Furthermore, the impact can generate high flash temperature and leads to data reliability problems, such as partial or full data erasure. This work report a method to conduct controlled experimental investigations into the possibility of such a data erasure even when the temperature is far below the Curie temperature. Results indicate that the high density magnetic transitions are of high likelihood of being affected by the flash temperature. Investigations also extended to micromagnetic modeling of the flash temperature effect. Results suggest that thermally induced local stress can play important roll in the data erasure process. Modeling results also exhibit that smaller grain size and higher recording density are also of higher likelihood of getting the transitions being affected by the flash temperature.