Apparatus and method of measuring write magnetic field of...

Details Apparatus and method of measuring write magnetic field of... Apparatus and method of measuring write magnetic field of...

2006-07-18

2006-07-18

Young, Wayne (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

C360S031000, C360S066000

Reexamination Certificate

active

07079340

ABSTRACT:
After a measurement apparatus records a magnetization state of a reference pattern on at least one specific track of a recording medium, it generates a leakage magnetic field of a demagnetization pattern and demagnetizes the magnetization state of the reference pattern using the leakage magnetic field. Then, the measurement apparatus calculates a difference between the read output of a reference pattern before demagnetization and the read output of a reference pattern after demagnetization on the specific track and obtains a leakage magnetic field of a recording head from the obtained difference.

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