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Warning System for GMR products using Read element resistance

IP.com Disclosure Number: IPCOM000014666D
Original Publication Date: 2002-Feb-01
Included in the Prior Art Database: 2003-Jun-20

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Damages either physical or chemical at the GMR senor creates risks of amplitude degradation, instability and other functional problems. This can occur during manufacturing process/test and/or high humidity stress environmental conditions. The system will monitor/record the resistance(R) change to diagnose the integrity of the GMR sensor. Initial R can be from any phase of drive's life Fig.1 (i.e. HDE,HSA,HGA level). HSA,HGA component values will be monitored/recorded on external systems( i.e. Server) and from Mfg test on the internal measurement circuit(built in AE,Card) will be used to record any R changes . HSA/HGA data will be stored in the drive during the mfg test.. Examples of it's applications are listed below: 1) Mfg process/test screening, using delta from Slider,HSA (Fig.1) 2) GMR corrosion monitoring: Early warning for sensor degradation (Fig.2)