一种能够在高达34 T的比特尔磁体中进行显微镜检查和光谱分析的低温扫描隧道显微镜。

A low-temperature scanning tunneling microscope capable of microscopy and spectroscopy in a Bitter magnet at up to 34 T.

作者信息

Tao W, Singh S, Rossi L, Gerritsen J W, Hendriksen B L M, Khajetoorians A A, Christianen P C M, Maan J C, Zeitler U, Bryant B

机构信息

High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands.

Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands.

出版信息

Rev Sci Instrum. 2017 Sep;88(9):093706. doi: 10.1063/1.4995372.

DOI:10.1063/1.4995372

PMID:28964167

Abstract

We present the design and performance of a cryogenic scanning tunneling microscope (STM) which operates inside a water-cooled Bitter magnet, which can attain a magnetic field of up to 38 T. Due to the high vibration environment generated by the magnet cooling water, a uniquely designed STM and a vibration damping system are required. The STM scan head is designed to be as compact and rigid as possible, to minimize the effect of vibrational noise as well as fit the size constraints of the Bitter magnet. The STM uses a differential screw mechanism for coarse tip-sample approach, and operates in helium exchange gas at cryogenic temperatures. The reliability and performance of the STM are demonstrated through topographic imaging and scanning tunneling spectroscopy on highly oriented pyrolytic graphite at T = 4.2 K and in magnetic fields up to 34 T.

摘要

我们展示了一种低温扫描隧道显微镜（STM）的设计与性能，该显微镜在水冷比特磁铁内部运行，可实现高达38 T的磁场。由于磁铁冷却水产生的高振动环境，需要独特设计的STM和振动阻尼系统。STM扫描头设计得尽可能紧凑和坚固，以最小化振动噪声的影响并符合比特磁铁的尺寸限制。STM使用差动螺杆机构进行粗调针尖 - 样品接近，并在低温下的氦交换气体中运行。通过在T = 4.2 K和高达34 T的磁场下对高度取向的热解石墨进行形貌成像和扫描隧道谱，证明了STM的可靠性和性能。