Sharp Fe/MgO/Ge(001) epitaxial heterostructures for tunneling junctions

Sharp Fe/MgO/Ge(001) epitaxial heterostructures for tunneling junctions
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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
M. Varela
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
D. Petti;M. Cantoni;C. Rinaldi;S. Brivio;R. Bertacco;J. Gázquez;M. Varela

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本文报道了用分子束外延法生长Fe/MgO/Ge(001)异质结的研究。MgO/Ge界面的最低氧化和最高锐度对应于一个Ge晶胞数量级的过渡层,对于MgO层的室温生长随后在500 °C的真空中退火获得。在这些条件下,MgO层在Ge(001)上外延生长,[110]方向平行于Ge的[100]方向,这与Si(001)和GaAs(001)上的立方体叠立方体生长不同。然而,在某些情况下,MgO在Ge上的立方体对立方体生长模式与涉及45°旋转的模式竞争,如在300 °C下生长的MgO膜上的透射电子显微镜和光电子衍射数据所揭示的,而没有退火后,以及在p掺杂的Ge衬底上。对于Fe覆盖层,在所有报道的情况下,室温生长,然后退火至200 °C,产生了尖锐的界面和众所周知的Fe晶格相对于...
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