Title :
Interferometric spacing measurements of the Bernoulli head/disk interface
Author :
Wahl, Michael H. ; Briggs, J.C. ; Talke, Frank E.
Author_Institution :
Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Head-to-disk spacing in a flexible disk drive (Bernoulli technology) is measured interferometrically using monochromatic light in conjunction with a grey level interpolation scheme. Measurements in the center region of a Bernoulli head indicate that the minimum head-disk separation is less than 50 nm, suggesting that the asperity contacts occur in the area of the closest approach. The spacing distribution of a typical Bernoulli head is reported, as well as a parameter study of spacing as a function of rotational speed
Keywords :
distance measurement; floppy discs; light interferometry; magnetic heads; Bernoulli head/disk interface; asperity contacts; flexible disk drive; grey level interpolation scheme; head-disk separation; light interferometry; monochromatic light; rotational speed; spacing distribution; Area measurement; Assembly; Couplings; Disk drives; Interpolation; Magnetic devices; Magnetic heads; Magnetic recording; Magnetic separation; Optical interferometry;
Journal_Title :
Magnetics, IEEE Transactions on
