167. investigation of contamination at the head-disk interface in today's hard disk drives

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Center for Magnetic Recording Research (CMRR)
Faculty Advisor(s): Frank E. Talke

Primary Student
Name: Young Woo Seo
Email: ywseo@ucsd.edu
Phone: 818-428-5112
Grad Year: 2017

Abstract
In order to increase the areal density of hard disk drives, the flying height has reduced to sub-nanometer regime. At this small spacing, the head-disk interface has become more susceptible to contamination by organic compounds, specifically hydrocarbon, and polyfluoropolyether (PFPE) lubricant. Experimental investigation using equipments such as gas chromatograph mass spectrometry (GC-MS) and optical surface analyzer (OSA) was performed to understand the crystallinity of linear alkane chains in the presence of branched hydrocarbons. Also, numerical study was performed using molecular dynamics (MD) to understand the same phenomenon in more detail. We also used MD simulations to study the lubricant transfer at the head-disk interface in a heat-assisted magnetic recording (HAMR) hard disk drives. Laser was simulated as a non-translational kinetic energy input to PFPE lubricants on the disk surface. The phenomenon was studied as a function of laser pulse duration, fluence, and repetition rate.

Industry Application Area(s)
Electronics/Photonics | Materials | Semiconductor

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