Abstract
Siloxane outgas is well known to cause the smear on magnetic head sliders. Siloxane outgas is vaporized from a part in hard disk drives (HDDs), that adsorbs on the magnetic disk surfaces, and SiO2 denatured from siloxane by the flash temperature at a slider and disk contact is accumulated on the slider surface. On the other hand, the heat assisted magnetic recording (HAMR) is being developed to improve the areal density. In HAMR, a laser light heats the magnetic disk surface by 400 − 500 K. If siloxane is adsorbing on disk surface, that easily desorbs from disk surface and that may thermally dissociates by laser heating. In this study, we studied the smear growth from siloxane outgas at laser heating. As the results, we confirmed that the siloxane adsorbed on disk surface grew on the glass surface opposed to disk surface at the laser heating spot.
