Morphological change in FePt nanogranular thin films induced by swift heavy ion irradiation
Morphological change in FePt nanogranular thin films induced by swift heavy ion irradiation
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DOI：
10.1016/j.nimb.2009.03.079
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发表时间：
2009-05-15
影响因子：
1.3
通讯作者：
Matsumura, S.
中科院分区：
文献类型：
--
作者：
Shirai, M.;Tsumori, K.;Matsumura, S.
研究了210 MeV Xe离子辐照下FePT纳米颗粒薄膜(FePT)(47)(Al(2)O(3))(53)的形貌变化。在这里，除了传统的透射式电子显微镜技术，如亮场观察和扫描电子显微镜能量色散X射线能谱(STEM-EDX)分析之外，电子层析技术被广泛用于阐明辐照样品的三维(3D)结构。离子辐照导致FePT纳米粒子粗化，并沿束流方向伸长。电子断层三维重建图像清楚地表明，当注量达到5.0×10(14)ion/cm(2)时，辐照表面形成了粗糙的FePT球，薄膜内部的粒子沿离子轨迹变形为棒状。经1.0×10(15)Xe离子/cm(2)长时间辐照后，合金颗粒成分变得不均匀。颗粒中心富含铂，而Fe则轻微向外围重新分布。(C)2009爱思唯尔B.V.保留所有权利。
We have investigated morphology change of FePt nanogranular films (FePt)(47)(Al(2)O(3))(53) under irradiation with 210 MeV Xe ions. Here, electron tomography technique was extensively employed to clarify three-dimensional (3D) structure in irradiated specimens, in addition to conventional transmission electron microscopy (TEM) techniques such as bright-field observation and scanning TEM energy dispersive X-ray spectroscopy (STEM-EDX) analysis. The ion irradiation induces the coarsening of FePt nanoparticles with elongation along the beam direction. Electron tomography 3D reconstructed images clearly demonstrated that when the fluence achieves 5.0 x 10(14) ions/cm(2), well-coarsened FePt balls have been formed on the irradiated surface, and the particles in the film interior have been deformed into rods along the ion trajectory. The alloy particles become inhomogeneous in composition after prolonged irradiation up to 1.0 x 10(15) Xe ions/cm(2). The particle center is enriched with Pt, while Fe is slightly redistributed to the periphery. (C) 2009 Elsevier B.V. All rights reserved.