Characterization of Ultrathin Fe--Co Layer Grown on Amorphous Co--Fe--B by In situ Reflective High-Energy Electron Diffraction
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概要
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The textured MgO(001) tunnel barrier grown on CoFeB is a fundamental building block for spintronic devices such as magnetic tunnel junctions. Although the insertion of an ultrathin Fe--Co layer between an MgO layer and a bottom CoFeB layer is a common technique for improving the magnetoresistance effect, the characteristics of this technique remain unclear. We systematically investigated the as-grown structure of Fe--Co by reflective high-energy electron diffraction and found that a highly textured MgO(001) is formed only on an amorphous Fe--Co surface. The diffusion of B atoms from underlying CoFeB into Fe--Co is what makes the as-grown Fe--Co layer amorphous.
- 2013-06-25
著者
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Yuasa Shinji
National Inst. Advanced Industrial Sci. And Technol.(aist) Ibaraki Jpn
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Tsunekawa Koji
Process Development Center Canon Anelva Corporation
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Nagamine Yoshinori
Process Development Center Canon Anelva Corporation
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Yuasa Shinji
National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Ibaraki 305-8568, Japan
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Hosoya Hiroyuki
Process Development Center, Canon ANELVA Corporation, Kawasaki 215-8550, Japan
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Zayets Vadym
National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Ibaraki 305-8568, Japan
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