Head-disc dynamics of low resonance laser textures-a spectrogram analysis

• Published in: IEEE transactions on magnetics Vol. 34; no. 4; pp. 1699 - 1701
• Main Authors: Yao, W.H., Kuo, D., Ku, R., Marchon, B., Sundaram, R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.07.1998; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Band pass filters; Disk recording; Electronics; Exact sciences and technology; Laser excitation; Magnetic devices; Magnetic heads; Magnetic resonance; Other magnetic recording and storage devices (including tapes, disks, and drums); Resonant frequency; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Sensor arrays; Sensor systems; Spectrogram; Testing; Head disk interface; Spectrometry; Slip; Acoustic emission; Magnetic head; Magnetic disk; Experimental study; Magnetic recording
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.706676

Spectrogram analysis provides a systematic way to study the head-disc interface dynamics and demonstrates how the frequency spectrum varies during the head take-off or landing. The regular pattern laser texture has strong input excitations, which includes not only the fundamental frequency of bump pitch density but also the higher order harmonics. When the excitation frequencies intercept the system resonance frequencies, such as the slider/sensor body natural frequencies, the sensor output is amplified, which causes a false reading in the glide testing and glide avalanche measurement. Spiral-line laser texture solves the problem of resonance by completely removing the source of excitation.