Preparation of Superconducting Niobium Tips for Atomic-Resolution Scanning Tunneling Microscopy/Spectroscopy

被引：4
|
作者：
Shimizu, Ryota [1 ,2 ]
Hitosugi, Taro [2 ]
Hashizume, Tomihiro [2 ,3 ,4 ]
Fukuo, Noritaka [5 ]
Hasegawa, Tetsuya [1 ]
机构：
[1] Univ Tokyo, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan
[2] Tohoku Univ, Adv Inst Mat Res, World Premier Int Res Ctr Initiat, Sendai, Miyagi 9808577, Japan
[3] Hitachi Ltd, Adv Res Lab, Hatoyama, Saitama 3500395, Japan
[4] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[5] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2010年 / 49卷 / 02期
关键词：
NB;
D O I：
10.1143/JJAP.49.028004
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We present a new reliable method to prepare superconducting niobium (Nb) tips for scanning tunneling microscopy/spectroscopy (STM/STS). Sharp Nb tips were fabricated by chemical etching using an electrolyte based on a hydrofluoric acid and hydrogen peroxide solution, followed by field evaporation utilizing field ion microscopy to remove Nb oxide layers from the tip apex. STM/STS measurements of Si(111) and Au(111) surfaces confirmed that the tips had atomic resolution capability together with bulk-like superconducting properties, indicating that the prepared Nb tips can be used as a unique probe for investigating local superconducting and magnetic properties on an atomic scale. (C) 2010 The Japan Society of Applied Physics
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页数：2
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