Adhesion Forces for Sub-10 nm Flying-Height Magnetic Storage Head Disk Interfaces

[+] Author and Article Information
Sung-Chang Lee, Andreas A. Polycarpou

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

J. Tribol 126(2), 334-341 (Apr 19, 2004) (8 pages) doi:10.1115/1.1645299 History: Received February 11, 2003; Revised September 16, 2003; Online April 19, 2004
Copyright © 2004 by ASME
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Schematic of the Lennard-Jones interatomic potential between two atoms or macro spheres (asperities)
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Typical AFM topographical images of (a) disk media (σ=0.38 nm) and (b) slider air-bearing surface (σ=0.64 nm)
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Typical ultra-low flying HDI: (a) Schematic of HDI; (b) HDI showing flying-height (FH); (c) Interfacial forces at HDI (Fa=Air-bearing force, Fs=Adhesion force, P=Contact force, F=Pre-load); and (d) Micrograph of an actual 30% ultra low flying recording slider.
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Schematic of an equivalent rough surface in contact with a flat surface in the presence of molecularly thin lubricant, showing the flying-height (FH)
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(a) Adhesion forces and (b) contact forces versus fly-height for 3 different roughness values shown in Table 2
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Schematics of a “flying” slider over (a) rough disk, (b) smooth disk, and (c) extremely smooth disk
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Adhesion and contact forces versus flying-height: (a) rough interface (σ=3.4 nm); (b) smooth interface (σ=0.74 nm); and (c) extremely smooth interface (σ=0.2 nm)
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Adhesion force versus flying-height with different standard deviation of surface heights; (a) σ=0.8 nm; and (b) σ=1.3 nm (R=5.0 μm, η=10.0 μm−2 , An=1500 μm2)
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Pull-off force simulation results for the three different roughness HDI’s
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SEM images of FIB’d AFM probes: (a) Smallest area of contact (∼0.0004 μm2 ); (b) Intermediate area of contact (5.8 μm2 ); and (c) Largest area of contact (8.1 μm2 )
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AFM pull-off force measurement for the intermediate area of contact (5.8 μm2 ) using the totally lubed (TL) magnetic disk
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Pull-off force measurements and simulation results based on the SBL model (TL=Totally Lubed, DL=DeLubed)



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