Composition- and oxidation-controlled magnetism ternary FeCoNi nanocrystals  

作　　者：Maogang Gong Ridwan Sakidja Shenqiang Ren 

机构地区：[1]Department of Mechanical Engineering, Temple University, Philadelphia, PA 19122, USA [2]Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO 65897, USA

出　　处：《Nano Research》2016年第3期831-836,共6页纳米研究（英文版）

基　　金：S. R. thanks the financial support from the U.S. National Science Foundation （NSF） （No. NSF-DMR-1551948） （magnetically hard nanocrystals） and （No. NSF- CMMI-1553986） （nanomanufacturing）.

摘　　要：Ternary FeCoNi metallic nanostructures have attracted significant attention due to their high saturation magnetization, unique mechanical properties, and large corrosion resistance. In this study, we report a controlled synthesis of ternary FeCoNi nanocrystals using solution-based epitaxial core-shell nanotechnology. The thickness and stoichiometry of the FeCoNi nanocrystals affect their magnetic characteristics, which can be controlled by a phase transformation-induced tetragonal distortion. Furthermore, surface oxidation of the stoichiometry-controlled FeCoNi nanostructures can drastically enhance their magnetic coercivity （up to 8,881.60e for AuCu-FeCo）, and optimize the AuCu-FeCo08Ni0.2 performance corresponding to the saturated magnetization of 134.4 emu-g-1 and coercivity of 4,036.70e, which opens the possibility of developing rare-earth free high energy nanomagnets.Ternary FeCoNi metallic nanostructures have attracted significant attention due to their high saturation magnetization, unique mechanical properties, and large corrosion resistance. In this study, we report a controlled synthesis of ternary FeCoNi nanocrystals using solution-based epitaxial core-shell nanotechnology. The thickness and stoichiometry of the FeCoNi nanocrystals affect their magnetic characteristics, which can be controlled by a phase transformation-induced tetragonal distortion. Furthermore, surface oxidation of the stoichiometry-controlled FeCoNi nanostructures can drastically enhance their magnetic coercivity （up to 8,881.60e for AuCu-FeCo）, and optimize the AuCu-FeCo08Ni0.2 performance corresponding to the saturated magnetization of 134.4 emu-g-1 and coercivity of 4,036.70e, which opens the possibility of developing rare-earth free high energy nanomagnets.

关 键 词：iron-cobalt-nickel NANOMAGNETISM magnetocrystallineanisotropy core-shell nanocrystals 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ153.2[化学工程—电化学工业]