Measurement method of time dependent magnetic remanence in a recording medium
US6147488A · kind A · utility
13Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Mar 27, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A testing method for a magnetic recording medium which is magnetized measures variation of magnetization with the passage of time and evaluates the magnetic recording medium over its life. The method includes the steps of recording a first pattern at a density to be guaranteed in the magnetic recording medium, the first pattern having a difference between the sum total of areas of +bits and the sum total of areas of -bits, measuring remanence of the first pattern with the passage of time, and evaluating the magnetic recording medium over its life based on a measurement result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.