The first pinning structure may include an odd number of first ferromagnetic layers and the second pinning structure may include {HEAD ~ an even number} of {TAIL ~ 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 an odd number of first ferromagnetic layers and the second pinning structure may include { HEAD ~ an even number } of { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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