Abstract
Ultrathin [Co/Pt]n superlattice films consisting of 0.18–0.60-nm-thick Co and Pt sublayers were deposited by sputtering. A large in-plane saturation field (Hs) of ∼39 kOe and a very large effective perpendicular magnetic anisotropy (Keff) with a magnitude of 107 erg/cm3 were attained. The highest Keff was ∼1.40 × 107 erg/cm3. These films are promising candidates for the reference layer of the p-MgO magnetic tunnel junction in Gb-scale magnetic random-access memory.
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