A hybrid magnet based scanning tunneling microscope
A hybrid magnet based scanning tunneling microscope
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基于混合磁体的扫描隧道显微镜
DOI：
10.1063/1.5140423
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发表时间：
2020-05-01
影响因子：
1.6
通讯作者：
Lu, Qingyou
中科院分区：
文献类型：
--
作者：
Wang, Jihao;Geng, Tao;Lu, Qingyou
本文介绍了一种在27.5 T磁场下工作的扫描隧道显微镜（STM）。采用惯性压电电机实现STM的粗进路，采用独立安装在蓝宝石底座上的微型扫描仪实现扫描。采用由砖-橡胶-砖堆和两个弹簧组成的组合隔振系统对磁体产生的振动进行隔振。一个封闭的铜屏蔽用来防止声音进入尖端样品结。隔声隔振措施大大提高了STM成像的稳定性。所有用于制造STM磁头的材料都是非磁性的。环境条件下，STM在X-Y平面和Z方向的漂移速率分别低至26.2 pm/min和34.6 pm/min。在没有真空和低温保护的情况下，在0 ~ 27.5 T的磁场范围内获得的石墨六边形晶格图像证明了自制STM的高性能。据目前所知，这是第一个在混合磁铁中工作的STM。这也是第一个可以在高达27.5 t的磁场下获得石墨六边形晶格图像的STM，我们的研究结果对进一步在环境条件和超高磁场下的STM研究有很大的贡献。
In this paper, a scanning tunneling microscope (STM) is presented that operates in a 27.5 T magnetic field within a hybrid magnet. The coarse approach of the STM is realized by using an inertial piezoelectric motor, and the scanning is realized by using a miniature scanner, which stands alone on a sapphire base. A combined vibration isolation system consisting of a brick-rubber-brick stack and two springs is used to isolate the vibration generated from the magnet. An enclosed copper shield is used to prevent sound from entering the tip-sample junction. The sound and vibration isolation measures highly improve the stability of the STM imaging. All the materials selected to construct the STM head are nonmagnetic. The drift rates of the STM in the X-Y plane and Z direction are as low as 26.2 pm/min and 34.6 pm/min, respectively, under ambient conditions. The high performance of the homebuilt STM was demonstrated by graphite hexagonal lattice images obtained in magnet fields ranging from 0 T to 27.5 T even without the protection of a vacuum and low temperatures. As far as known, this is the first STM that operates in a hybrid magnet. It is also the first STM that can obtain graphite hexagonal lattice images in magnetic fields up to 27.5 T. Our results greatly contribute to the further STM studies under ambient conditions and ultrahigh magnetic fields.