Method and apparatus for testing magnetic head with spin-valve m

Details Method and apparatus for testing magnetic head with spin-valve m Method and apparatus for testing magnetic head with spin-valve m

1998-03-06

1999-12-07

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

324223, G01R 3312, G01N 2772, G11B 5455

Patent

active

059989939

ABSTRACT:
A method of testing a magnetic head with a spin-valve MR element which includes at least a pinned layer, a free layer and a non-magnetic layer for magnetically separating the pinned layer and the free layer. The method includes a step of measuring an output voltage of the spin-valve MR element under application of an external alternating magnetic field to the magnetic head in a direction parallel to a magnetization direction of the pinned layer, a step of obtaining a .rho.-H loop characteristics of the spin-valve MR element from the measured output voltage, and a step of judging pinned direction of the spin-valve MR element in accordance with a polarity of an inclination of the obtained .rho.-H loop characteristics.

REFERENCES:
patent: 5206590 (1993-04-01), Dieny et al.
patent: 5422571 (1995-06-01), Gurney et al.

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