The effect of multilayer structure on magnetic properties of FePt thin films  

作　　者：Kaifeng DONG Xiaofei YANG Junbing YAN Weiming CHENG Xiaomin CHENG 

机构地区：[1]Department of Electronic Science ＆： Technology, Huazhong University of Science ＆ Technology,Wuhan 430074, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2009年第1期22-26,共5页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.60571010);Natural Science Foundation of Hubei province.

摘　　要：The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe （5.2 nm）/Pt （5.2 nm）]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity.The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe （5.2 nm）/Pt （5.2 nm）]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity.

关 键 词：L10-FePt thin films Multilayer structure COERCIVITY Ordering temperature 

分 类 号：TG14[一般工业技术—材料科学与工程]