Effect of Sm-doping on the morphology and magnetic properties of radio frequency magnetron sputtered Ni-Mn-Ga films  

作　　者：Feng-hua Chen Min-gang Zhang Yue-sheng Chai Chang-wei Gong 

机构地区：[1]College of Materials Science and Engineering, Taiyuan University of Science and Technology, Talyuan 030024, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2012年第6期555-560,共6页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 61178067);the Natural Science Foundation of Shanxi Province, China (No.2010011032-1);the Graduate Innovation Fund of Shanxi Province, China (Grants No.20093096);the Taiyuan University Innovation and Entrepreneurship Thematic Projects (No. 100115154)

摘　　要：Ni55.5Mn21Ga23.5 and Ni54Mn22Ga23Sml films were prepared by radio frequency （RF） magnetron sputtering. The effect of Sm do- pant on the morphologic and magnetic properties of Ni55.5Mn21Ga23.5 films was investigated. Sm doping can refine the particle size of the films from 100 to 60 nm, and further grain growth is not occurs even after annealing at 1073 K for 3.6 ks. Compared to Ni55.5Mn21Ga23.5 films, Sm-doped Ni54Mn22Ga23Sml films are easier to be magnetized and have a lower martensitic transformation temperature. In addition, the Curie temperature can also be adjusted, decreasing from 350 to 325 K after Sm doping. Martensitic transformation is not observed in the Sm-free films, which is close to the Curie temperature in the Sm-doped films, giving rise to the overlap of the structural and magnetic transi- tion temperatures.Ni55.5Mn21Ga23.5 and Ni54Mn22Ga23Sml films were prepared by radio frequency （RF） magnetron sputtering. The effect of Sm do- pant on the morphologic and magnetic properties of Ni55.5Mn21Ga23.5 films was investigated. Sm doping can refine the particle size of the films from 100 to 60 nm, and further grain growth is not occurs even after annealing at 1073 K for 3.6 ks. Compared to Ni55.5Mn21Ga23.5 films, Sm-doped Ni54Mn22Ga23Sml films are easier to be magnetized and have a lower martensitic transformation temperature. In addition, the Curie temperature can also be adjusted, decreasing from 350 to 325 K after Sm doping. Martensitic transformation is not observed in the Sm-free films, which is close to the Curie temperature in the Sm-doped films, giving rise to the overlap of the structural and magnetic transi- tion temperatures.

关 键 词：magnetic films SAMARIUM DOPING magnetron sputtering martensitic transformation magnetic transition temperature MAGNETICPROPERTIES rare earths 

分 类 号：O484.1[理学—固体物理] O482.5[理学—物理]