Sensitive magnetic readback head-disk spacing measurements in recording drives

Novotný, V.; Hsiao, Meng-Jie

doi:10.1109/20.706698

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“…This can be done by simply using the average magnitude of the readback signal. There have been quite a few papers addressing the possibility, and as small as 0.2 nm resolution has been reported [11]. There is also research on a capacitive fly height sensor which requires deposition of films on the bottom of the slider.…”

Section: Other Issuesmentioning

confidence: 99%

A MEMS-based monolithic electrostatic microactuator for ultra-low magnetic disk head fly height control

2001

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A novel MEMS-based electrostatic actuator design is proposed for recording head fly height control below 10 nm. Different from prior work on MEMS-based electrostatic microactuators designed for magnetic hard disk drives (HDD), the proposed microactuator is fabricated monolithically with a conventional head/slider design. The actuator is micromachined into the same side as the head element on a slider with a modified CMOS-MEMS process. It has an extremely small size, light weight and a very simple structure. The head is suspended and actuated up and down by the actuator during recording process to maintain a constant fly height. A desired range and precision of actuation is achieved under control voltages of less than 30 V. A mechanical resonant frequency of over 100 kHz is obtained.

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Section: Other Issuesmentioning

confidence: 99%