Measurement method of time dependent magnetic remanence in a rec

Details Measurement method of time dependent magnetic remanence in a rec Measurement method of time dependent magnetic remanence in a rec

1998-03-27

2000-11-14

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, 365 58, G01N 2776, G01R 3312

Patent

active

061474886

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.

REFERENCES:
patent: 4641093 (1987-02-01), Melgui et al.

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