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