Sharp Fe/MgO/Ge(001) epitaxial heterostructures for tunneling junctions
Sharp Fe/MgO/Ge(001) epitaxial heterostructures for tunneling junctions
复制标题
用于隧道结的尖锐 Fe/MgO/Ge(001) 外延异质结构
DOI:
10.1063/1.3554834
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发表时间:
2011
影响因子:
3.2
通讯作者:
M. Varela
中科院分区:
文献类型:
--
作者:
D. Petti;M. Cantoni;C. Rinaldi;S. Brivio;R. Bertacco;J. Gázquez;M. Varela
We report on the growth of epitaxial Fe/MgO/Ge(001) heterostructures by molecular beam epitaxy. The lowest oxidation and highest sharpness of the MgO/Ge interface, corresponding to a transition layer on the order of one Ge unit cell, is obtained for room temperature growth of the MgO layer followed by annealing in a vacuum at 500 °C. In these conditions, the MgO layer grows epitaxially on Ge(001) with the [110] direction parallel to the [100] direction of Ge, at variance with the cube-on-cube growth on Si(001) and GaAs(001). However, in some cases, the cube-on-cube growth mode of MgO on Ge competes with the mode involving a 45° rotation, as revealed by transmission electron microscopy and photoelectron diffraction data on MgO films grown at 300 °C without postannealing, and on p-doped Ge substrates. For the Fe overlayer, in all the cases reported, room temperature growth followed by annealing up to 200 °C gives rise to a sharp interface and the well-known 45° rotation of the Fe lattice with respect to the...
DOI:
--
发表时间:
2016
期刊:
ECS trans
影响因子:
--
作者:
T. Nakayama;S. Sasaki;Y. Asayama
通讯作者:
Y. Asayama