Jw is a write current density, {HEAD ~ t} is {TAIL ~ a thickness} of the free layer, A is a constant 
is
Jw is a write current density , { HEAD ~ t } is { TAIL ~ a thickness } of the free layer , A is a constant
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH