Origin of (0 0 1) orientation and superlattice structure identification in L10-FePt/B4C multilayer thin films
Origin of (0 0 1) orientation and superlattice structure identification in L10-FePt/B4C multilayer thin films
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DOI：
10.1016/j.apsusc.2015.10.136
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发表时间：
2015-12
影响因子：
6.7
通讯作者：
Jun Zhang;Jianshan Xie;Yi Wang;Hanbin Wang;Xiang Liu;C. Ye;Hao Wang
中科院分区：
文献类型：
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作者：
Jun Zhang;Jianshan Xie;Yi Wang;Hanbin Wang;Xiang Liu;C. Ye;Hao Wang
采用磁控溅射法在非晶衬底上制备了（0 0 1）织构L10 FePt/B4 C多层薄膜。高分辨透射电子显微镜研究表明，Fe和Pt原子沿L10 FePt轴向沿着交替堆积，证实了L10 FePt超晶格结构的形成。内应力计算和几何相分析证实了L10 FePt薄膜中存在面内张应变。B和C原子向FePt层中的扩散导致界面处的FePt晶胞膨胀，从而在FePt层的邻近深部产生面内拉伸应变。这种面内拉伸应变为FePt薄膜稳定（0 0 1）织构创造了有利条件，因为它使FePt在相变过程中的有序应变能弛豫。
(0 0 1) texturedL10FePt/B4C multilayer thin films have been prepared on amorphous substrates by magnetron sputtering. High resolution transmission electron microscopy investigation indicates that the Fe and Pt atoms stacked alternately along thec-axis ofL10FePt, confirming the formation of the superlattice structure ofL10-ordered FePt. The internal stress calculation and geometrical phase analysis confirm the existence of the in-plane tensile strain in theL10FePt thin films. The diffusion of the B and C atoms into the FePt layers results in expansion of the FePt unit cells in the interfaces, which induces an in-plane tensile strain in the adjacent deep parts of FePt layer. Such an in-plane tensile strain creates a favorable condition for the FePt films to stabilize the (0 0 1) texture because it relaxes the ordering strain energy of FePt during phase transformation.