Observation of bulk Bragg-reflection using reflection high-energy electron diffraction on Mn3O4-like films grown on MgO (001) by molecular beam epitaxy

被引：7

作者：

Guo, LW ^{[1
]}

Hanada, T ^{[1
]}

Ko, HJ ^{[1
]}

Chen, YF ^{[1
]}

Makino, H ^{[1
]}

Yao, T ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 980, Japan

来源：

SURFACE SCIENCE | 2000年 / 445卷 / 2-3期

关键词：

manganese; molecular beam epitaxy; reflection high-energy electron diffraction (RHEED); surface structure morphology roughness and topography;

D O I：

10.1016/S0039-6028(99)01018-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Bulk Bragg diffraction spots are observed in the reflection high-energy electron diffraction (RHEED) pattern of Mn3O4-like films, whose surfaces consist of truncated-pyramid hillocks. The bulk Bragg diffraction spots are superposed on sharp streaks due to the flat top-face of the truncated pyramids. The appearance of the bulk Bragg diffraction spots is found to be critically dependent on the surface morphology. The incidence of the electron beam at the side facets of the truncated pyramids is found to give rise to the bulk Bragg diffraction spots. It is found that the incident angle of the electron beam with respect to the facet plane should be larger than 11 degrees to observe bulk Bragg diffraction spots from the Mn3O4-like films. In the Bragg diffraction spots, a kinematically forbidden 006 diffraction spot has been observed, which can be attributed to a dynamic diffraction effect. Based upon the RHEED patterns, the crystal structure and lattice parameters of the films are directly obtained. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：151 / 158

页数：8

共 10 条

[1]

BAUER E, 1969, TECHNIQUE DIRECT O 2, P502

[2] GAAS EPITAXY BY A MOLECULAR BEAM METHOD - OBSERVATIONS OF SURFACE STRUCTURE ON (001) FACE [J].