Large modulation of perpendicular magnetic anisotropy by CoPt3 induction in Co/Pt multilayers with Fe2O3 inserting

• Published in: Journal of magnetism and magnetic materials Vol. 586; p. 171218
• Main Authors: Li, Minghua, Liang, Hongming, Chen, Yu, Liu, Zhuoyao, Jia, Jingran, Liu, Yantai, Shi, Hui, Yu, Guanghua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2023
• Subjects: Co/Pt multilayers; CoPt3; Fe2O3 inserting; Interface regulation; Perpendicular magnetic anisotropy; Thermal stability; CoPt3; Co/Pt multilayers; Fe2O3 inserting; Interface regulation; Perpendicular magnetic anisotropy; Thermal stability
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2023.171218

•Keff is related to the capping layers, Co thickness, Fe2O3 thickness and annealing temperature of Pt/Co films.•The crystallized Pt/Co layer, moderate CoOx, and an interface with low roughness were critical for obtaining strong PMA.•Fe2O3 regulation is a good way to increase the PMA and thermal stability in the Pt/Co multilayer. The effect of ultra-thin discontinuous Fe2O3 inserting on the perpendicular magnetic anisotropy (PMA) in Ta(3)/Pt(1)/[Pt(1)/Fe2O3(t)/Co(0.4)]3/Pt(2)/Ta(4) films(unit:nm)is studied. It is found that the addition of Fe2O3 blocked the connection between Pt and Co at the Pt/Co interface and prevented the generation of Co/Pt superlattice structure in the as-deposited film, so that the film does not show PMA. After 400 ℃ annealing, CoPt3(111) structure was formed and the film exhibited PMA. The film with Fe2O3 inserting has better CoPt3(111) crystal structure and lower coercivity than those without inserting. Inserting Fe2O3 is good way to increase the PMA and thermal stability in [Co/Pt]n multilayer.