Local electronic structure of Fe(001) surfaces studied by scanning tunneling spectroscopy
Local electronic structure of Fe(001) surfaces studied by scanning tunneling spectroscopy
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DOI：
10.1103/physrevb.68.045422
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发表时间：
2003-07-15
影响因子：
3.7
通讯作者：
van Kempen, H
中科院分区：
文献类型：
--
作者：
Bischoff, MMJ;Yamada, TK;van Kempen, H
用扫描隧道谱研究了Fe（001）晶须的局域电子结构。的dI/dV曲线的表观峰能量上的电压依赖性的背景的影响进行了讨论。建立了该背景与表观势垒高度之间的关系。先前报道的自旋极化的d（z）2-类表面状态被证明是由0.04 eV的量转移到更高的能量在孤立的氧杂质的Fe（001）表面。表面状态在[100]和[110]方向的台阶上消失。最后，我们通过研究纳米Fe岛表面态的行为来研究尺寸效应。除了在台阶边缘的表面态淬火，峰移到更高的能量被观察到为减少岛的大小。
Scanning tunneling spectroscopy is used to study the local electronic structure of Fe(001) whiskers. The influence of a voltage dependent background on the apparent peak energies in the dI/dV curves is discussed. A relation between this background and the apparent barrier height is established. The previously reported spin-polarized d(z)2-like surface state is shown to shift by an amount of 0.04 eV to higher energies at isolated oxygen impurities on the Fe(001) surface. The surface state disappears on both [100] and [110] directed steps. Finally, we investigated size effects by studying the behavior of the surface state on nanometer-sized Fe islands. Besides the surface-state quenching at the step edges, a peak shift to higher energies is observed for decreasing island sizes.