期刊
ACS NANO
卷 8, 期 2, 页码 1739-1744出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn4061034
关键词
magnesium oxide; atomic force microscopy; conductive AFM; scanning tunneling microscopy; thickness determination; thin oxide films; thin insulating films
类别
资金
- Office of Naval Research [N00014-11-C-0483]
The increasing technological importance of thin insulating layers calls for a thorough understanding of their structure. Here we apply scanning probe methods to investigate the structure of ultrathin magnesium oxide (MgO) which is the insulating material of choice in spintronic applications. A combination of force and current measurements gives high spatial resolution maps of the local three-dimensional insulator structure. When force measurements are not available, a lower spatial resolution can be obtained from tunneling images at different voltages. These broadly applicable techniques reveal a previously unknown complexity in the structure of MgO on Ag(001), such as steps in the insulator-metal interface.
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