Method of measuring non-linearity in magnetic...

Details Method of measuring non-linearity in magnetic... Method of measuring non-linearity in magnetic...

2005-08-23

2005-08-23

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S045000, C360S053000, C360S051000, C324S210000, C324S212000

Reexamination Certificate

active

06934100

ABSTRACT:
Method of accurately measuring various kinds of non-linear transition shifts (NLTSs) in the magnetic recording/reproduction using an MR-type reproducing head is provided.According to the method, the data of a reference bit-string pattern are sent, as reference signals, to a magnetic disk2via a head IC5and a magnetic head3so as to be magnetically recorded. A first predetermined harmonic component Vnref is measured from the reproduced signals of the record data detected by the magnetic head3,a bit-string pattern is selected from plural kinds of predetermined bit-string patterns, the data of the selected bit-string pattern are sent, as to-be-measured signals, to the magnetic disk2,a second predetermined harmonic component Vnpat is measured from the reproduced signals, and the NLTS is calculated from Vnref and Vnpat.

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“A Generalized Frequency Domain Nonlinearity Measurment Method”, Xiaodong Che, et al.;IEEE Transactions on Magnetics, vol. 30, No. 6; Nov. 1994.
“Non-Linear Interactions in a Series of Transitions”,Alexander Taratorin et al.;IEEE Transactions on Magnetics, vol. 33, No. 1; Jan. 1997.

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