Microstructure and in-plane component of L1₀-FePt films deposited on MgO and MgAl₂O₄ substrates

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• 作者：H. Sepehri-Amin^a ; ^{h.sepehriamin@nims.go.jp} ; H. Iwama^b ; T. Ohkubo^a ; T. Shima^b ; K. Hono^a ; ¹
• 关键词：FePt ; Microstructure ; In-plane coercivity ; Lattice mismatch
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：247-251
• 全文大小：1534 K
• 卷排序：130

文摘

Microstructures of FePt films deposited on MgO and MgAl2O4 single crystalline substrates were studied using aberration corrected scanning transmission electron microscopy (STEM). The [100] and [010] variants of L10-FePt were observed in-the-plane of the FePt grains deposited on the MgAl2O4 substrate, which causes in-plane component in magnetization curves. The d-spacing of the (002) planes of L10-FePt deposited on MgAl2O4 is larger than that deposited on MgO. The reduction of lattice mismatch between FePt and the substrate results in the formation of out-of-plane tensile strain leading to increase in d002 and the formation of the in-plane variants in the L10-FePt grains.