An Investigation of the Take-Off Behavior of Proximity Recording Sliders Using Acoustic Emission and Phase Demodulated Interferometry

Author:

McMillan T. C.1,Talke F. E.1

Affiliation:

1. Center for Magnetic Recording, University of California, San Diego, La Jolla, CA 92093-0401

Abstract

The “take-off” behavior of proximity recording sliders is investigated using acoustic emission and phase demodulated laser interferometry. A biquadratic surface fit of the air bearing surface is used to determine the position of the slider with respect to the disk. Acoustic emission data is examined in both the time and frequency domain to analyze the location of slider/disk contacts. Two distinct frequencies are observed in the frequency spectrum of the acoustic emission signal, corresponding to torsional mode and bending mode vibrations of the rigid slider. As the velocity increases, the magnitude of the torsional mode decreases relative to that of the bending mode, indicating that slider/disk contacts change from side rails contacts to trailing edge contacts.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Reference9 articles.

1. Baugh, E., Weissner, S., and Talke, F. E., 1998, “Biquadratic Models for Slider Air Bearing Surface,” to be published in IEEE Trans. on Mag.

2. Benson R. C. , SundaramR., and TalkeF. E., 1988, “A Study of Acoustic Emission from Slider/Disk Interface in a 5-Inch Hard Disk Drive,” ASLE Special Publication: Tribology and Mechanics of Magnetic Storage System, Vol. 5, pp. 87–93.

3. Briggs J. C. , ChangM.-K., and TseM.-K., 1992, “High Frequency Slider Vibrations during Asperity Impacts in Rigid Magnetic Disk System,” Adv. Info. Storage Syst., Vol. 4, pp. 181–194.

4. Henze D. , MuiP., CliffordG., and DavidsonR. J., 1989, “Multi-Channel Interferometric Measurements of Slider Flying Height and pitch,” IEEE Trans. on Magn., Vol. 25, No. 5, pp. 3710–3712.

5. Kita T. , KogureK., MitsuyaY., and NakanishiT., 1980, “New Method of Detecting Contact Between Floating-Head and Disk,” IEEE Trans. on Magn., Vol. 16, No. 5, pp. 873–875.

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