Apparatus and method of measuring write magnetic field of recording head
US7079340B2 · kind B2 · utility
4Cited by
9References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 17, 2004 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Nov 17, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2525
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.