In situ transport measurements on ultrathin Bi(111) films using a magnetic tip: possible detection of current-induced spin polarization in the surface states
In situ transport measurements on ultrathin Bi(111) films using a magnetic tip: possible detection of current-induced spin polarization in the surface states
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DOI：
10.1088/1367-2630/15/10/105018
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发表时间：
2013-10
影响因子：
3.3
通讯作者：
T. Tono;T. Hirahara;S. Hasegawa
中科院分区：
文献类型：
--
作者：
T. Tono;T. Hirahara;S. Hasegawa
利用四尖扫描隧道显微镜对生长在Si(111)表面的超薄Bi(111)薄膜的输运进行了原位测量。当电流注入尖端(非磁性铂涂层碳纳米管尖端)和电压尖端(磁性CoFe涂层碳纳米管尖端)之间的距离小于1μm时，我们发现在没有自旋输运的情况下，格林互易定理是成立的。这被解释为电流诱导自旋极化(CISP)的信号，该信号是由于Bi(111)的Rashba自旋分裂表面态带而发生的。这一结果与基于Rashba系统的CISP理论的定量分析是合理一致的。
We performed in situ transport measurements of ultrathin Bi(111) films grown on Si(111) surface, with a four-tip scanning tunneling microscope using metal-coated carbon nanotube (CNT) tips. When the distance between the current injection tip (nonmagnetic Pt-coated CNT tip) and voltage tip (magnetic CoFe-coated CNT tip) was smaller than 1 μm, we found a violation of Green's reciprocity theorem which should hold with no spin transport. This was interpreted as a signal of the current-induced spin polarization (CISP) that occurs due to the Rashba spin-splitting surface-state bands of the Bi(111). The result was reasonably in accord with quantitative analyses based on the CISP theory of Rashba systems.