The weak magnetic field sensor 1, in which {HEAD ~ material} of {TAIL ~ the magnetic layer} is selected from a group consisting of amorphous metal, Permalloy and Supermalloy 
The weak magnetic field sensor 1 , in which { HEAD ~ material } of { TAIL ~ the magnetic layer } is selected from a group consisting of amorphous metal , Permalloy and Supermalloy
OTH OTH OTH OTH OTH OTH OTH OTH OTH 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