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Cu掺杂对Fe_xPt_1-x薄膜有序化的影响

The effect of Cu doping on the ordering of Fe_xPt_1-x thin films

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【Author】 Li Bao-He~ 1)2) Feng Chun~ 1) Yang Tao~ 1) Zhai Zhong-Hai~ 1)3) Teng Jiao~ 1) Yu Guang-Hua~ 1) Zhu Feng-Wu~ 1) 1)(Department of Material Physics and Chemistry, Beijing University of Science and Technology, Beijing 100083,China)2)(Department of Mathmatics and Physics, Beijing Technology and Business University, Beijing 100037,China)3)(College of Science, Shenyang Jianzhu University, Shenyang 110168,China)

【机构】北京科技大学材料物理系；北京科技大学材料物理系北京100083；北京工商大学数理部；北京100037；北京100083；沈阳建筑大学理学院；沈阳110168；

【摘要】利用磁控溅射制备了薄膜厚度为50nm的系列(FexPt1-x)100-yCuy(x=0·46—0·56,y=0,0·04,0·12)样品.利用直流共溅射方法精确控制Fe和Pt的原子比.实验结果表明,当x>0·52时,样品中添加Cu不能促进FePt的有序化,但是对于FePt化学原子定比或富Pt的样品,添加Cu可以促进FePt有序化,而且随着Fe含量的减少,需要更多的Cu添加才能实现较低温度下FePt薄膜的有序化.实验结果表明,原子比(FeCu)/Pt达到1·1—1·2的范围时,即可实现较低温度的有序化.更多还原

【Abstract】 (Fe_xPt1-x )100-y Cu_y（x=0.46—0.56,y=0,0.04,0.12） thin films with a fixed thickness of 50nm have been prepared by magnetron sputtering. The atomic ratio of Fe to Pt atoms was accurately controlled by DC co-sputtering. The ordering parameter of the L1₀ phase is not enhanced for the films with x>0.52. On the contrary, the ordering process is improved by the addition of Cu for the Pt-rich or stoichiometric thin films. In order to get the ordering of FePt films at a low annealing temperature, the lower the Fe content, the more addition of Cu is needed. It is found that the L1₀ phase can be obtained after annealing at 350℃ for 20 min only for films with the ratio of the （FeCu）/Pt in the range of 1.1—1.2.更多还原