System and method for testing a write head in a combined magneti

Details System and method for testing a write head in a combined magneti System and method for testing a write head in a combined magneti

1997-08-28

2000-08-29

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

369 53, G01R 3312, G11B 5455, G11B 539

Patent

active

061114065

ABSTRACT:
A method for assessing write element performance in a combined magnetic head that also includes a magneto-resistive (MR) read element for a data storage drive includes exciting the write element with a square wave immediately after lapping the head during manufacture, before mounting the head for operation in the drive. The write element generates an output signal, and the output signal is detected by the read element and then used to determine whether the write element is defective. By using a square wave, temperature gradients in the head and inductive pick up is avoided, thereby facilitating the use of the read element as a test sensor.

REFERENCES:
patent: 5479098 (1995-12-01), Yakoyama et al.
patent: 5721488 (1998-02-01), Sakai et al.
G.A. Gibson, S. Schultz, T. Carr & T. Jagielinksi, "Spatial Mapping Of The Sensitivity Function Of Magnetic Recording Heads Using A Magnetic Force Microscope As A Local Flux Applicator", IEEE Transactions On Magnetics, vol. 28, No. 5, Sep. 1992.

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