title: Effects of Ru and Ag cap layers on microstructure and magnetic properties of FePt ultrathin films.
abstract: The effects of Ru and Ag cap layers on the microstructure and magnetic properties of the FePt ultrathin films have been investigated. The results indicate that i) The Ag cap layer segregates from the FePt/Ag bilayer, lowers the FePt ordering temperature, promotes the FePt thin films to form island structure, and enhances the coercivity; ii) The Ru cap layer increases the FePt ordering temperature, helps to maintain smooth continuous structure film, and restrains the FePt (001) orientation and perpendicular magnetic anisotropy (PMA). The effects become more pronounced for the 3-nm-thick FePt thin films. The effects can be mainly attributed to the different melting point and thermal expansion stress between the cap layer and FePt thin films.
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Mingfeng
authors.initials: M
authors.lastname: Liu
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Tianli
authors.initials: T
authors.lastname: Jin
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Hao
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Jiangwei
authors.initials: J
authors.lastname: Cao
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Dongping
authors.initials: D
authors.lastname: Wu
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Bai
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000 People's Republic of China.
authors.forename: Fulin
authors.initials: F
authors.lastname: Wei
keywords: Cap layer effect; FePt thin film; Perpendicular magnetic anisotropy