Atomic resolution scanning tunneling microscope imaging up to 27 T in a water-cooled magnet
Atomic resolution scanning tunneling microscope imaging up to 27 T in a water-cooled magnet
复制标题
在水冷磁体中原子分辨率扫描隧道显微镜成像高达 27 T
DOI：
10.1007/s12274-015-0889-5
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发表时间：
2015-12-01
期刊：
影响因子：
9.9
通讯作者：
Lu, Qingyou
中科院分区：
文献类型：
--
作者：
Meng, Wenjie;Guo, Ying;Lu, Qingyou
我们报告了第一个原子分辨的扫描隧道显微镜（STM）成像在水冷磁体（WM），非常苛刻的振动和噪声一直是主要的挑战。这种定制的WM-STM具有超刚性和紧凑的扫描头，其中粗方法由我们新设计的TunaDrive压电电机驱动。采用三级弹簧悬挂系统进行隔振。在非常强的磁场的存在下，获得了具有质量原子分辨率的石墨的室温原始数据图像，磁场强度高达27 T，在32 mm直径的孔WM中，最大磁场强度为27.5 T，额定功率为10 MW，通过核磁共振（NMR）校准。27 T的磁场强度超过了传统超导磁体所能达到的最大磁场强度。此外，我们的WM-STM已经为STM成像铺平了道路，使用45 T，32 mm直径的混合磁铁，这是世界上最强大的旗舰磁铁，产生最强的稳定磁场。
We report the first atomically resolved scanning tunneling microscope (STM) imaging in a water-cooled magnet (WM), for which extremely harsh vibrations and noise have been the major challenge. This custom WM-STM features an ultra-rigid and compact scan head in which the coarse approach is driven by our newly designed TunaDrive piezoelectric motor. A three-level spring hanging system is used for vibration isolation. Room-temperature raw-data images of graphite with quality atomic resolution were acquired in the presence of very strong magnetic fields, with a field strength up to 27 T, in a 32-mm-diameter bore WM with a maximum field strength of 27.5 T at a power rating of 10 MW, calibrated by nuclear magnetic resonance (NMR). This record field strength of 27 T exceeds the maximal field strength achieved by the conventional superconducting magnets. Besides, our WM-STM has paved the way to STM imaging using a 45 T, 32-mm-diameter bore hybrid magnet, which is the world’s flagship magnet, producing the strongest steady magnetic field.