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

doi:10.1016/S1006-7191(08)60066-6

Abstract

Abstract:

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 theas-deposited 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.

Key words: L1₀-FePt thin films, Multilayer structure, Coercivity, Ordering temperature

Kaifeng DONG,Xiaofei YANG,Junbing YAN,Weiming CHENG,Xiaomin CHENG. The effect of multilayer structure on magnetic properties of FePt thin films[J]. Acta Metallurgica Sinica (English Letters), 2009, 22(1): 22-26.

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