Perpendicular Magnetic Anisotropy in Face-Centered Cubic (111) Co90Fe10/Pt Superlattices

• Published in: IEEE magnetics letters Vol. 6; pp. 1 - 4
• Main Authors: Jinjun Qiu, Zhaoliang Meng, Qi Jia Yap, Yi Yang, Geok, Ng Lay Serene, Guchang Han
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.01.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Anisotropic magnetoresistance; Magnetic field measurement; Magnetic superlattices; Nonhomogeneous media; Perpendicular magnetic anisotropy; superlattice; thermal stability; superlattice; thermal stability; General topics; perpendicular magnetic anisotropy; magnetization dynamics
• ISSN: 1949-307X; 1949-3088
• DOI: 10.1109/LMAG.2015.2392078

Ultrathin (Co 90 Fe 10 /Pt) 8 superlattices composed of alternating CoFe (thickness 0.21 nm) and Pt (thickness 0.23 nm) monolayers were deposited by magnetron sputtering. Superlattices deposited at ultralow sputtering power and high Ar pressure showed perpendicular magnetic anisotropy (PMA) whereas superlattices deposited at higher power and lower pressure and a cosputtered Pt-CoFe alloy film exhibited in-plane magnetic anisotropies. X-ray diffraction and atomic force microscopy showed that the PMA was mainly contributed by the interface anisotropy at Pt/CoFe interfaces. The PMA constant of the superlattice (Co 90 Fe 10 /Pt) 8 deposited under optimized conditions is as high as 6 × 10 6 erg/cm 3 .