The effect of tape surface roughness on the head-tape interface is investigated for typical head contours using tapes with different surface roughness characteristics. Intensity-based monochromatic interferometry is used to obtain the asperity compliance curves for tapes of different roughness by relating contact pressure to the spacing between the head and the tape. A parabolic model and the Greenwood-Williamson model for contact between rough surfaces are used to “curve fit” experimental results for contact pressure versus spacing, and numerical calculations for the head-tape spacing of a cylindrical head with and without transverse slots are presented for two tapes with different roughness characteristics. The numerical calculations for the head-tape spacing are compared with experimental measurements showing excellent agreement between numerical and experimental results. It is concluded that the head-tape spacing for high recording density applications is limited by tape surface roughness.

Issue Section:
Research Papers
Topics:
Surface roughness, Pressure, Density, Interferometry
1.
Baugh, E., and Talke, F. E., 1995, “The Head/Tape Interface: A Critical Review and Recent Results,” submitted for publication in STLE Tribology Transactions.
2.
Chan, K., Lacey, C., Talke, F. E., and Dey, S., 1995, “The Effect of Design Parameters on the Head/Tape Interface,” Advances in Information Storage Systems, Vol. 6.
3.
Greenwood
 
J. A.
, and
Williamson
 
J. B. P.
,
1966
, “
Contact of Nominally Flat Surfaces
,”
Proceedings of the Royal Society of London
, Series A
295
, pp.
300
–
319
.
4.
Handzel-Powierza
 
Z.
,
Klimczak
 
T.
, and
Polijaniuk
 
A.
,
1992
, “
On the Experimental Verification of the Greenwood-Williamson Model for the Contact of Rough Surfaces
,”
Wear
, Vol.
154
, pp.
115
–
124
.
5.
Heinrich, J., and Wadhwa, S., 1986, “Analysis of Self-Acting Foil Bearings: A Finite Element Approach,” Tribology of Mechanics in Magnetic Storage System, STLE SP-21, Vol. 3, pp. 152–159.
6.
Heinrich
 
J.
, and
Connolly
 
D.
,
1992
, “
Three-dimensional Finite Element Analysis of Self-acting Foil Bearings
,”
Computer Methods in Applied Mechanics and Engineering
, Vol.
100
, pp.
31
–
43
.
7.
Lacey, C., and Talke, F. E., 1992a, “Measurement and Simulation of Partial Contact at the Head Tape Interface,” ASME JOURNAL OF TRIBOLOGY Oct., pp. 646–652.
8.
Lacey, C., and Talke, F. E., 1992b, “Simulation of Wear of Tape Head Contours,” IEEE Transactions on Magnetics, Sept., pp. 2554–2556.
9.
Lacey, C., and Talke, F. E., 1993, “The Effect of Head Wear and Tape Shear on the Head/Tape Interface,” Tribology Transactions, No. 3, pp. 87–392.
10.
Lacey, C., and Talke, F. E., 1990, “A Tightly Coupled Numerical Foil Bearing Solution,” IEEE Transactions on Magnetics, Nov., pp. 3039–3043.
11.
Stahl
 
K. J.
,
White
 
J. W.
, and
Deckert
 
K. L.
,
1974
, “
Dynamic Response of Self-Acting Foil Bearings
,”
IBM Journal of Research and Development
, Vol.
18
, pp.
513
–
520
.
12.
Wahl, M. H., Casmer, S., and Talke, F. E., 1994, “Multi-wavelength Intensity-based Interferometry for Flexible Head-medium Interface,” Tribology and Mechanics in Magnetic Storage System, STLE SP-36, Vol. 9, pp. 17–24.
13.
Wallace
 
R. L.
,
1951
, “
The Reproduction of Magnetically Recorded Signals
,”
Bell Systems Technical Journal
, Vol.
30
, pp.
1145
–
1160
.
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