In-situ measurement of reader gap length

In-situ measurement of reader gap length

We are presenting a technique to perform the reader-gap length in-situ measurement. It utilizes the presence of the first gap minimum on the third harmonic readback signal spectrum to calculate the electrical reader-gap length, and factor the electrical result to the physical reader-gap length. Comp...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Wenyao Wang, Hong Huo, Tan, V.M.H.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Fourier series
Frequency estimation
gap loss term
Geometry
Head
Image sensors
Length measurement
Performance evaluation
Permeability
Predictive models
Reader-gap length
third harmonic readback signal
Wavelength measurement
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Beschreibung
Zusammenfassung:We are presenting a technique to perform the reader-gap length in-situ measurement. It utilizes the presence of the first gap minimum on the third harmonic readback signal spectrum to calculate the electrical reader-gap length, and factor the electrical result to the physical reader-gap length. Compared with existing metrology-based methods, the measurement is non-destructive, dynamic, and insensitive against the skew angle change.
DOI:10.1109/APMRC.2009.4925401