The first pinning structure may include {HEAD ~ an odd number} of first ferromagnetic layers and {TAIL ~ the second pinning structure} may include an even number of second ferromagnetic layers so as to enable the sensor to provide a differential signal when a current flows through the sensor 
The first pinning structure may include { HEAD ~ an odd number } of first ferromagnetic layers and { TAIL ~ the second pinning structure } may include an even number of second ferromagnetic layers so as to enable the sensor to provide a differential signal when a current flows through the sensor
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH