{TAIL ~ A magnetoresistive sensor} has at least a trilayer stack comprising a cap layer, {HEAD ~ a first ferromagnetic layer}, and a second ferromagnetic layer separated by a nonmagnetic layer 
{ TAIL ~ A magnetoresistive sensor } has at least a trilayer stack comprising a cap layer , { HEAD ~ a first ferromagnetic layer } , and a second ferromagnetic layer separated by a nonmagnetic layer
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