Method for determining the magnetic contamination of a surface

Details Method for determining the magnetic contamination of a surface Method for determining the magnetic contamination of a surface

1996-11-19

1998-12-01

Larkin, Daniel S.

Measuring and testing

Surface and cutting edge testing

738658, 73866, G01N 3300

Patent

active

058441298

ABSTRACT:
In the manufacture of magnetic data carriers, such for example, hard-disk storages, it must be assured that neither the data carrier itself nor component parts of the data carrier system situated in the proximity has magnetic contaminants. An improved measuring method allows the determination of the magnetic contaminants which were attached to an adhesive tape applied to the surface being examined. The improvement is that a magnetized soft-magnetic measuring substrate has a surface provided with a parting agent which is then brought into contact with the magnetic contaminants adhering to the adhesive tape. A reduction of the remanent field that is produced by this contact represents a criterion for the magnetic contamination of the surface under examination.

REFERENCES:
patent: 5000203 (1991-03-01), Hamada

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