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arXiv 1111.5938cond-mat.mtrl-sci
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Pt(111)表面氧化铁薄膜的生长及其电子和磁性结构

Growth and electronic and magnetic structure of iron oxide films on Pt(111)

N. Spiridis, D. Wilgocka-Ślȩzak, K. Freindl, B. Figarska, T. Giela, E. Młyńczak, B. Strzelczyk, M. Zajac, J. Korecki

摘要:

通过铁的反应沉积或金属铁单层的氧化,在Pt(111)单晶上生长超薄(111)取向的极性铁氧化物薄膜。这些薄膜,其特征在于使用低能电子衍射,扫描隧道显微镜和转换电子穆斯堡尔谱。Fe的反应性沉积导致Fe3O4的岛状生长,其中块体材料的电子和磁性被调制的超顺磁性尺寸效应的厚度小于2 nm,揭示特定的表面和界面特征。相比之下,氧化物薄膜与FeO的化学计量,这可以稳定的厚度为4纳米,在特殊的制备条件下,具有电子和磁性,是非常不同的,从他们的本体对应物,wüstite。不寻常的长程磁序出现在室温下的厚度为3至10个单层,其外观需要从岩盐结构严重的结构修改。

英文摘要:

Ultrathin (111)-oriented polar iron oxide films were grown on a Pt(111) single crystal either by the reactive deposition of iron or oxidation of metallic iron monolayers. These films were characterized using low energy electron diffraction, scanning tunneling microscopy and conversion electron Mossbauer spectroscopy. The reactive deposition of Fe led to the island growth of Fe3O4, in which the electronic and magnetic properties of the bulk material were modulated by superparamagnetic size effects for thicknesses below 2 nm, revealing specific surface and interface features. In contrast, the oxide films with FeO stoichiometry, which could be stabilized as thick as 4 nm under special preparation conditions, had electronic and magnetic properties that were very different from their bulk counterpart, wüstite. Unusual long range magnetic order appeared at room temperature for thicknesses between three and ten monolayers, the appearance of which requires severe structural modification from the rock-salt structure.

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