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