Investigation of hard drive disk surface oxidation on magnetic recording properties

ISSN： 1743-2944

Source： Surface Engineering, Vol.24, Iss.1, 2008-01, pp. : 36-39

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Abstract

Hard drive disk magnetic recording properties are strongly related to disk surface oxidation, and becomes more sensitive as the areal recording density continues to increase progressively in hard disk drives. Disk cleaning processes with and without H₂O₂ chemical cleaning solutions were used on textured NiP/Al substrates to study the effects of surface oxidation on the performance of the hard disk. Atomic force microscopy, magnetic force microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, vibrating sample magnetometer and Guzik are employed to elucidate the surface morphology, oxide composition, magnetic orientation ratio and related magnetic recording properties.Based on the results, cleaning without H₂O₂ chemical solutions offers a lower surface oxidation, more uniform surface morphology, higher orientation ratio and better magnetic recording properties as compared to cleaning with H₂O₂ chemical solutions. A lower direct current erase noise is the major contributing factor for the resulting signal noise ratio improvement when H₂O₂ was not added in cleaning process.