Time-Frequency Analysis of Slider Dynamics and the Effect of Lubricant

The dynamics of pico sliders is investigated during scratch impact using laser Doppler vibrometry. Air-bearing frequencies and damping of the pitch-2 frequency are studied as a function of disk velocity for lubricant thickness values of 1.6 nm, 1.0 nm and 2.0 nm. Time-frequency analysis is performed to study the instantaneous air-bearing frequencies. System identification methods are used to model the response of the slider after a scratch impact. The results indicate that the slider dynamics and the damping coefficients are affected by the disk velocity and lubricant thickness and also possibly by disk micro-waviness. @DOI: 10.1115/1.1695568#

[1]  Frank E. Talke,et al.  Dynamics of transient events at the head/disk interface , 2001 .

[2]  David B. Bogy,et al.  Experimental Evaluation of Stiffness and Damping of Slider-Air Bearings in Hard Disk Drives , 1999 .

[3]  B. Liu,et al.  Experimental Study of Slider-Disk Interaction in a Nanometer Spaced Head-Disk Interface , 1999 .

[4]  Youmin Liu,et al.  Acoustic Emission Study Of Lubricant Effect On Proximity Contact Recording , 1997, 1997 IEEE International Magnetics Conference (INTERMAG'97).

[5]  Y. C. Lee,et al.  Dip-coating of ultra-thin liquid lubricant and its control for thin-film magnetic hard disks , 1995 .

[6]  Frank E. Talke,et al.  Investigation of Slider Vibrations Due to Contact With a Smooth Disk Surface , 2001 .

[7]  H. Tanaka,et al.  Slider dynamics during continuous contact with textured and smooth disks in ultra low flying height , 2000, 2000 Asia-Pacific Magnetic Recording Conference. Digests of APMRC2000 on Mechanical and Manufacturing Aspects of HDD (Cat. No.00EX395).

[8]  F. Talke,et al.  Spreading and mobility analysis of PFPE lubricants using a Surface Reflectance Analyzer (SRA) , 2003 .

[9]  J. C. Harrison,et al.  An explanation of the observed frequency domain behavior of head-disk interface resonances in the proximity recording regime , 1999 .

[10]  Khaled H. Hamed,et al.  Time-frequency analysis , 2003 .

[11]  Frank E. Talke,et al.  The Effect of Slider Surface Texture on Flyability and Lubricant Migration under Near Contact Conditions , 2003 .

[12]  Junguo Xu,et al.  Contact Vibration of Micro-Textured Sliders , 2002 .