Details

Autor(en) / Beteiligte

• Yakushiji, K.
• Saruya, T.
• Kubota, H.
• Fukushima, A.
• Nagahama, T.
• Yuasa, S.
• Ando, K.

Titel

Ultrathin Co/Pt and Co/Pd superlattice films for MgO-based perpendicular magnetic tunnel junctions

Ist Teil von

• Applied physics letters, 2010-12, Vol.97 (23), p.232508-232508-3

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ultrathin [ Co / Pt ] n and [ Co / Pd ] n superlattice films consisting of 0.14-0.20-nm-thick Co and Pt(Pd) layers were deposited by sputtering. A large perpendicular magnetic anisotropy [ ( 3 - 9 ) × 10 6   ergs / cm 3 ] and an ideal square out-of-plane hysteresis loop were attained even for ultrathin superlattice films with a total thickness of 1.2-2.4 nm. The films were stable against annealing up to 370 ° C . MgO-based perpendicular magnetic tunnel junctions with this superlattice layer as the free layer showed a relatively high magnetoresistance ratio (62%) and an ultralow resistance-area product ( 3.9   Ω μ m 2 ) at room temperature. The use of these films will enable the development of gigabit-scale nonvolatile memory.