Test components fabricated with pseudo sensors used for...

Details Test components fabricated with pseudo sensors used for... Test components fabricated with pseudo sensors used for...

2011-04-26

2011-04-26

Patidar, Jay M (Department: 2858)

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

Reexamination Certificate

active

07932717

ABSTRACT:
Test methods and components are disclosed for testing resistances of magnetoresistance (MR) sensors in read elements. Test components are fabricated on a wafer with a first test lead, a pseudo sensor, and a second test lead. The test leads and MR sensor are fabricated with similar processes as first shields, MR sensors, and second shields of read elements on the wafer. However, the pseudo sensor in the test component is fabricated with lead material (or another material having similar resistance properties) instead of an MR thin-film structure like an MR sensor. Forming the pseudo sensor from lead material causes the resistance of the pseudo sensor to be insignificant compared to the lead resistance. Thus, a resistance measurement of the test component represents the lead resistance of a read element. An accurate resistance measurement of an MR sensor in a read element may then be determined by subtracting the lead resistance.

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