film has a thickness preferably in the range of between about 0 5 and about 1 5 nm with a most preferred thickness of about 1 nm the ru film is used as an upper portion of the decoupling layer in order to facilitate the overlying longitudinal pinned and pinning layers to exhibit a high pinning field the ru film has a thickness preferably in the range of between about 1 and about 3 nm with a most preferred thickness of about 2 nm a longitudinal pinned layer 418 is formed above the decoupling layer 416 the longitudinal pinned layer 418 is preferably formed of a co u2014 fe film with an fe content preferably in the range of between about 10 and about 18 at and a most preferred fe content of about 14 at the longitudinal pinned layer 418 has a thickness preferably in the range of between about 0 9 and about 5 4 nm to provide a designed magnetic moment in the range of between about 0 12 and about 0 72 memu cm 2 with a most preferred thickness of about 2 7 nm corresponding to a magnetic moment of about 0 36 memu cm 2 the magnetic moment of the longitudinal pinned layer 418 is preferably 1 5 times of that of the sense layer in order to achieve sensor stability a longitudinal pinning layer 420 is formed above the longitudinal pinned layer 418 the longitudinal pinning layer 420 is preferably formed.