Consideration and compensation for precision optical flying height measurement |
| |
Authors: | YS Ma B Liu |
| |
Affiliation: | (1) Data Storage Institute, 5, Engineering Drive 1, Singapore, 117608, Singapore |
| |
Abstract: | It is a big challenge to determine ultra-low slider flying height accurately. The intensity interferometry flying height testing
method is widely used to determine slider flying height. However, the intrinsic measurement errors of the method are becoming
non-negligible with the decrease in slider flying height. Strategies have to be developed to minimize the errors. To measure
flying height with a normal incidence optical flying height tester, a calibration process is required to determine several
constants used in flying height calculation. In practice, the calibration is usually done simply by retracting the slider
from the disk and measuring the intensity minima and maxima of the interferogram during the retracting process. It has been
demonstrated that the single most important source of error in the flying height measurement is associated with errors in
the determination of the intensity maxima and minima. In this work, the effects of optical filter, the responding frequency
of photodetector, and the lack of the first order intensity minimum on the determination of the intensity maxima and minima
are studied. Methodologies to minimize the errors in flying height measurement caused by the above factors are developed. |
| |
Keywords: | flying height intensity interferometry calibration compensation hard disk drive |
本文献已被 SpringerLink 等数据库收录! |
|