Method and system for measuring spacing in a perpendicular...

Details Method and system for measuring spacing in a perpendicular... Method and system for measuring spacing in a perpendicular...

2007-07-23

2010-12-14

Feild, Joseph H (Department: 2627)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

Reexamination Certificate

active

07852581

ABSTRACT:
PMR spacing is measured by writing a pattern on a magnetic storage layer in non-return-to-zero notation, reading the pattern from the magnetic storage layer, analyzing a first harmonic component of the pattern that has a first amplitude, analyzing a second harmonic component of the pattern that has a second amplitude, measuring a ratio between the first and the second amplitudes of the first and second harmonic components, and determining a first spacing based on the ratio. In another embodiment, spacing is measured by analyzing a third harmonic component on the magnetic storage layer that has a third amplitude, measuring a difference in the amplitudes of the second and the third harmonic components while varying the first spacing and taking the ratio of the difference of the two each harmonic components.

REFERENCES:
patent: 6493184 (2002-12-01), Smith
patent: 7457072 (2008-11-01), Dieron et al.
patent: 2006/0209454 (2006-09-01), Kaizu et al.
Bo Liu and Zhimin Yuan, “In-situ Characterization of Head-Disk Clearance,” ASME Proceedings of Tribology Symposium on Interface Tribology towards 100 Gbit/in2 and Beyond, Oct. 1, 2000, pp. 51-58, Seattle, WA.
Zhen Jin et al., “Spinstand Measurement of Head Keeper Spacing in Perpendicular Recording,” IEEE Transactions on Magnetics, , vol. 41, No. 10, pp. 2270-2272, Oct. 2006.

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