Preparing spin-polarized scanning tunneling microscope probes on capped carbon nanotubes by Fe doping: A first-principles study

被引：7
|
作者：
Zou, Xiaolong [1 ]
Zhou, Gang [1 ]
Li, Jia [1 ]
Yan, Binghai [1 ]
Wu, Jian [1 ]
Gu, Bing-Lin [1 ]
Duan, Wenhui [1 ]
机构：
[1] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 19期
基金：
中国国家自然科学基金;
关键词：
adsorption; carbon nanotubes; density functional theory; doping; iron; magnetic moments; nanofabrication; scanning tunnelling microscopy; spin polarised transport; FIELD-EMISSION; SPECTROSCOPY; MOLECULES; ENERGY;
D O I：
10.1063/1.3134483
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Our first-principles calculations indicate the possibility of preparing spin-polarized scanning tunneling microscopy (SP-STM) probes from Fe-doped capped carbon nanotubes (CNTs). The structural stability, magnetic moment, and electronic property of hybrid systems are found to depend on the Fe adsorption site, which is attributed to the hybridization between Fe 3d and C 2p orbitals. The CNTs with Fe atoms adsorbed at the tip-top are demonstrated to be promising candidates for the SP-STM probe, with a high spin polarization leading to a completely spin-polarized current at lower voltages. In contrast, the CNTs encapsulating Fe atom are basically nonmagnetic, and thus useless for the SP-STM probe application in nature.
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页数：3
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