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Research Papers: Magnetic Storage

Air Bearing Surface Designs in Consideration of Thermomechanical Actuation Efficiency

[+] Author and Article Information
Shuyu Zhang, Sung-Chang Lee, Dongman Kim, Joerg Ferber, Brian Strom, George Tyndall

 Samsung Information Systems America, 75 West Plumeria Drive, San Jose, CA 95134

J. Tribol 130(4), 041901 (Aug 05, 2008) (6 pages) doi:10.1115/1.2958075 History: Received October 01, 2007; Revised June 06, 2008; Published August 05, 2008

Thermomechanical actuation (TMA) at the transducer region of the air bearing surface (ABS) protrudes from the transducer toward the recording media. This actuation induces a change in the air bearing pressure and a concomitant lift of the slider. The actual actuation in flying height divided by the TMA protrusion, defined as the TMA efficiency, is intimately coupled to the ABS design. After introducing an expression describing the changes in the air bearing forces due to the TMA protrusion, three approaches are proposed that facilitate the optimization of the ABS design for improving the TMA efficiency. These approaches include (a) reducing the air bearing pressure, (b) reducing the size of the TMA affected area, and (c) decoupling the peak air bearing pressure area from the TMA affected area. To illustrate these approaches, several ABS designs are evaluated by comparing their TMA efficiencies.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Effect of the TMA protrusion: slider flies at a height h at read transducer due to the air bearing induced by the rotating disk under it. Δh is the TMA protrusion and Δhact is the actual FH actuation after accounting for the TMA induced lift.

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Figure 2

(a) Pemto ABS and TMA protrusion. The numbers in it represent the etched recession. (b) Pressure field by solving the Reynolds equation for the same ABS with the TMA absent; the high pressure is located on the ABS of the central trailing pad.

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Figure 3

(a) AFM measurement of the TMA protrusion along the slider’s length. Its peak amplitude changes approximately linear to the power applied. (b) TMA protrusion used in the CML input file.

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Figure 4

FH changes due to the TMA protrusion. ID, MD, and OD stand for the inner, medium, and outer radii on the media of the disk, respectively.

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Figure 5

ABS designs for illustrating the approaches to increase TMA efficiency

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Figure 6

Air bearing pressure for the three ABS designs

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Figure 7

TMA efficiency for various ABS designs

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Figure 8

Air bearing pressure contour (unit in atm) at ID, MD, and OD. The ABS is the same as in the case of Fig. 5.

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Figure 9

Change of the ABS forces (in vertical) for the design used in the case for both Figs.  48

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