Liquid Nanodroplets on Thin Film Magnetic Recording Disks©

Autor:	Thomas E. Karis, Ullal Vasant Nayak
Rok vydání:	2004
Předmět:	Materials science Mechanical Engineering Nanotechnology Surfaces and Interfaces Tribology Surfaces Coatings and Films Contact angle Flying height Mechanics of Materials Ultrafine particle Microscopy Deposition (phase transition) Cloud condensation nuclei Thin film Composite material
Zdroj:	Tribology Transactions. 47:103-110
ISSN:	1547-397X 1040-2004
DOI:	10.1080/05698190490279010
Popis:	As magnetic recording slider size and flying height evolve to smaller dimensions, previously insignificant levels of contamination begin to play a role in slider media tribology. This article describes a new type of contamination. Liquid nanodroplets on disks originate with electrostatic deposition of hygroscopic ultrafine particles, also referred to as cloud condensation nuclei (CCN). On lubricated disks, the CCN equilibrate with atmospheric moisture and become partially overcoated with disk lubricant, which acts as a fluorocarbon surfactant. Dark-field microscopy measured deposition rates of 0.001 to 0.006 #/mm 2 /sec on initially clean disks exposed to ambient air in nonconductive cassettes. Tapping mode atomic force microscopy determined that the sites were deformable nanodroplets 70 to 300 nm in diameter and up to 150 nm high. From AFM profiles, the contact angle of the spherical capped nanodroplets with the disk was between 40 and 90 degrees. Nanodroplet contamination is characterized, and its effec...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1ec6b91cafb8321a04010d321c724719 https://doi.org/10.1080/05698190490279010 Zobrazit plný text záznamu