Effect of annealing on structure and magnetic properties of Fe-N and Fe-Ti-N thin films |
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| Authors: | HY Wang ZW Ma EY Jiang YJ He HS Huang |
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| Institution: | (1) Department of Physics, Tsinghua University, Beijing, 100084, P.R. China, CN;(2) Department of Applied Physics, Tianjin University, Tianjin, 300072, P.R. China, CN;(3) Department of Material Science and Engineering, Tsinghua University, P.R. China, CN |
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| Abstract: | The structure and magnetic properties of Fe-N and Fe-Ti-N films have been studied as a function of annealing temperature Ta with a transmission electron microscope and a vibrating sample magnetometer. The as-prepared Fe-N films consist of the γ′-Fe4N and α′′-Fe16N2 phases, and the Fe-Ti-N films are composed of the γ′-Fe4N, α′′-Fe16N2, and TiN phases. The structural changes with annealing temperature in the Fe-N films are distinct. The α′′-Fe16N2 decomposes into α+γ′ phases in the Fe-N film annealed at about 300 °C, and it disappears in the film annealed at 350 °C. Annealing of the Fe-Ti-N
films shows no structural changes between room temperature (RT) and 500 °C. The saturation magnetization 4πMS and coercivity Hc of the Fe-N films change drastically with the annealing temperature Ta, whereas those of the Fe-Ti-N films do not change with Ta up to 500 °C. These results indicate that the additon of Ti may improve the thermal stability of Fe-N films.
Recieved: 6 Juli 1998 / Accepted: 19 Oktober 1998 / Published online: 10 March 1999 |
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| Keywords: | PACS: 75 70-i 61 16 Bg 61 72 Ww |
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