Magnetic head tester

Details Magnetic head tester Magnetic head tester

2005-09-13

2005-09-13

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

Reexamination Certificate

active

06943545

ABSTRACT:
A magnetic head that includes a magnetoresistive effect read head element is tested by applying a varying magnetic field and measuring the resulting output signals from the read head element. The output signals are digitized and a processor calculates, e.g., the root mean square (RMS) of the signals or performs a Fast Fourier Transform or Autocorrelation on the data to determine if there is noise present. If desired, write and delay events may be performed prior to digitizing the output signals from the read head element to determine if additional noise, which is introduced to the magnetoresistive head from the write element, is present. In one embodiment, the digitizer may be replaced with an RMS meter.

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Nichols, M., “Comparison of the QST Noise Test to Other HGA Level Tests”, http://www.isiguys.com/Publications/QST%20Noise%20Report.pdf, dated Mar. 26, 2001, printed out Jun. 20, 2002, 12 pages.
Nichols, M., “Noise and Discontinuities in GMR Transfer Curves”, Intermag Europe (Apr. 2002), 3 pages.
Nichols, M., “Noise and Non-Linear Transfer Curves in GMR Heads”, IEEE (2002), 1 page, BD II.

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