Magnetoresistive sensor detectivity: A comparative analysis

We report on the noise performance characteristics of magnetic sensors using both tunnel junction (MTJ) and giant magnetoresistance (GMR) elements. Each sensor studied has a notably different detectivity. Of we measured, those based GMR multilayers have lowest However, also significantly smaller linear range. To make direct comparison between sensors, scale operating ranges each to be same. This is phenomenological equivalent modifying flux concentration. Upon scaling, low frequency detectivity tunneling (TMR) becomes essentially equal that sensor. Using scaling approach, are able place in context other key parameters, namely, size power consumption. Finally, use this technique examine upper limit for magnetoresistive notional MTJ present record setting TMR values.