35 T water-cooled magnet scanning tunneling microscope for in-plane magnetic field measurement.

IF 1.7 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
Dan Wu, Jihao Wang, Shuai Dong, Zihao Li, Rong Liang, Aile Wang, Min Zhang, Jing Zhang, Qiyuan Feng, Wenjie Meng, Yubin Hou, Qingyou Lu
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引用次数: 0

Abstract

Manipulating the direction of the magnetic field can induce various intriguing physical phenomena, such as the regulation of nematic phase and disappearance of the charge density wave. Conventional superconducting magnet-based scanning tunneling microscopes (STMs) operate with a perpendicular magnetic field direction to the sample surface, limiting their ability to investigate anisotropy of materials. Some STMs are integrated into vector magnets to achieve in-plane magnetic field conditions; however, these setups typically offer a maximum lateral magnetic field strength of less than 5 T, which is far below the critical magnetic field required for many materials. To explore the anisotropy of materials under in-plane magnetic fields exceeding 20 T, a new STM with small lateral tip-sample junction, which is capable of working in huge vibrational water-cooled magnets, is required. This paper presents an innovative design of such a small lateral size featured STM that is capable of operating under 35 T in-plane magnetic field conditions. The proposed STM utilizes an improved spider drive to drive the tip move in oblique upward direction, with the component of tip motion on the lateral direction being one-fifth of the vertical direction. With the novel design, the lateral size of the STM head is minimized to as small as 15 mm. The high rigidity of an independent scanner is proved by the high eigenfrequencies obtained through finite element analysis. The excellent imaging ability of our new STM are demonstrated by the high-quality atomic images of graphite and NbSe2 acquired under in-plane magnetic fields ranging from 0 to 35 T, illustrating the new STM's high immunity to the magnetic field conditions. As far as known, this is the first STM capable of atomic imaging at magnetic field up to 35 T and capable of working at both 300 and 1.7 K low temperature; this is also the first water-cooled magnet STM capable of atomic imaging under 35 T magnetic field and huge vibrational conditions. Using this STM, we expect to investigate novel physical phenomena occurring under high in-plane magnetic fields.

35t水冷磁扫描隧道显微镜,用于面内磁场测量。
控制磁场的方向可以引起各种有趣的物理现象,如向列相的调节和电荷密度波的消失。传统的超导磁体扫描隧道显微镜(STMs)在垂直于样品表面的磁场方向下工作,限制了它们研究材料各向异性的能力。一些stm集成到矢量磁体中,以实现面内磁场条件;然而,这些装置通常提供的最大横向磁场强度小于5t,远远低于许多材料所需的临界磁场。为了研究超过20 T的面内磁场下材料的各向异性,需要一种新的STM,具有小的横向尖端-样品结,能够在巨大的振动水冷磁体中工作。本文提出了一种创新的设计,这种小横向尺寸的特色STM能够在35t的面内磁场条件下工作。所提出的STM采用改进的蜘蛛驱动来驱动尖端向倾斜向上移动,尖端在横向上的运动分量为垂直方向的五分之一。采用新颖的设计,STM头的横向尺寸最小到15毫米。通过有限元分析得到的高特征频率证明了独立扫描器的高刚度。在0 ~ 35 T的面内磁场下获得的石墨和NbSe2的高质量原子图像证明了新型STM的优异成像能力,说明了新型STM对磁场条件的高抗扰性。据目前所知,这是第一个能够在高达35 T磁场下进行原子成像的STM,能够在300和1.7 K低温下工作;这也是第一个能够在35t磁场和巨大振动条件下进行原子成像的水冷磁体STM。利用这种STM,我们期望研究在高面内磁场下发生的新的物理现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Review of Scientific Instruments
Review of Scientific Instruments 工程技术-物理:应用
CiteScore
3.00
自引率
12.50%
发文量
758
审稿时长
2.6 months
期刊介绍: Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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