30 T scanning tunnelling microscope in a hybrid magnet with essentially non-metallic design

Meng, Wenjie; Zhao, Kesen; Wang, Jihao; Zhang, Jing; Feng, Qiyuan; Wang, Ze; Geng, Tao; Guo, Tengfei; Hou, Yubin; Pi, Li; Lu, Yalin; Lu, Qingyou

doi:10.1016/j.ultramic.2020.112975

Cited by 13 publications

(7 citation statements)

References 26 publications

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“…The tip-sample loop is ultra-compact, realizing high eigenfrequencies up to 11 155 Hz and 15 768 Hz in bending mode, 38 936 Hz in a torsional mode, and 65 842 Hz in a longitudinal mode simulated (as shown in figure 4(b), data from Finite Element Analysis.) [36,37]. Figure 5 shows image [38] data of graphite we obtained in ambient condition, demonstrating the feasibility and stability of this device.…”

Section: Experiments Resultsmentioning

confidence: 68%

“…Figure 5 shows image [38] data of graphite we obtained in ambient condition, demonstrating the feasibility and stability of this device. The rigidity, compactness, and nonmetallic design indicate that our device should work well under harsh environmental conditions, such as within a hybrid magnet [37,39]. The threshold voltage of the PM addressed by the STM measurements is about 160 V at 77 K.…”

Section: Experiments Resultsmentioning

confidence: 99%

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A compact, friction self-matching, non-inertial piezo motor with scanning capability

Zhao

Zheng

Wang

et al. 2023

Smart Mater. Struct.

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Maintaining friction matching is the core issue for non-inertial piezo motors (PMs); this challenge severely limits their application in complex conditions such as variable temperature environments. To address this issue, a compact, optimal friction self-matching PM with non-inertial driving is reported in this paper. The motor is implemented with a narrow 5.5mm-outer diameter piezoelectric scanner tube (PST) whose outer electrode is equally divided into two independently controllable PSTs. The PST, divided into two parts, clamps a sapphire rod between dual sapphire ball structures at both ends and an elastically supported sapphire ball at the centre. The device features a balanced normal force distribution scheme that allows friction forces acting on the sapphire rod at both ends and on the intermediate section to be approximately equal along the axial direction of the PST, achieving automatic optimal matching of friction, then it can operate like an inchworm motor. The feasibility of this scheme is verified by testing with a low threshold voltage down to 35V at room temperature and 160V at liquid nitrogen temperature. The motor dimensions are 5.5mm ×5.5mm ×35mm (length× width× height). At room temperature, step size ranges from 0.1um to 1um. It has a maximum stroke about 5mm and a maximum load of 40g. This PM’s extreme compactness, low machine tolerance requirements, and smooth sequence make it ideally suited for building superior quality, atomically resolved scanning probe microscopy devices compatible with narrow spaces and extreme conditions.

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Section: Experiments Resultsmentioning

confidence: 68%

Section: Experiments Resultsmentioning

confidence: 99%

A compact, friction self-matching, non-inertial piezo motor with scanning capability

Zhao

Zheng

Wang

et al. 2023

Smart Mater. Struct.

Self Cite

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show abstract

“…Since the voltage signals of the motor tube and scanning tube are applied separately, when the tip withdraws at a low temperature, the motor tube can receive a larger pulse voltage from a high potential on the outer electrodes to work more smoothly, which cannot be performed by the STM in Ref. [ 26 ].…”

Section: Stm Head Designmentioning

confidence: 99%

“…However, this structure has very high requirements for the processing accuracy and fit of the double sliders, which require high coaxiality to ensure that the large slider of the SpiderDrive will not generate a lateral force on the small slider fixed at the bottom of the scanning tube when we perform a tip-withdrawal operation. Therefore, in constructing our later 30 T hybrid magnet STM [ 26 ], we designed a single shaft structure based on the SpiderDrive principle. Since it uses a single piezoelectric tube (PT) to achieve the coarse approach and precise scanning, the lateral size of the PT cannot be too large because of the high stability and low drift rate required for scanning.…”

Section: Introductionmentioning

confidence: 99%

A Novel Atomically Resolved Scanning Tunneling Microscope Capable of Working in Cryogen-Free Superconducting Magnet

et al. 2023

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We present a novel homebuilt scanning tunneling microscope (STM) with atomic resolution integrated into a cryogen-free superconducting magnet system with a variable temperature insert. The STM head is designed as a nested structure of double piezoelectric tubes (PTs), which are connected coaxially through a sapphire frame whose top has a sample stage. A single shaft made of tantalum, with the STM tip on top, is held firmly by a spring strip inside the internal PT. The external PT drives the shaft to the tip–sample junction based on the SpiderDrive principle, and the internal PT completes the subsequent scanning and imaging work. The STM head is simple, compact, and easy to assemble. The excellent performance of the device was demonstrated by obtaining atomic-resolution images of graphite and low drift rates of 30.2 pm/min and 41.4 pm/min in the X–Y plane and Z direction, respectively, at 300K. In addition, we cooled the sample to 1.6 K and took atomic-resolution images of graphite and NbSe2. Finally, we performed a magnetic field sweep test from 0 T to 9 T at 70 K, obtaining distinct graphite images with atomic resolution under varying magnetic fields. These experiments show our newly developed STM’s high stability, vibration resistance, and immunity to high magnetic fields.

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“…Many important physical phenomena, such as quantum hall effect [ 18 , 19 ], are found in few-layer materials under high magnetic field conditions. Although a certain amount of STMs working at high magnetic fields [ 20 , 21 , 22 ] have been reported, none of them have demonstrated the ability of positioning and imaging micron-sized sample. Very few reported STMs [ 23 , 24 ] are equipped with an X–Y motor and have the ability to image small-sized samples.…”

Section: Introductionmentioning

confidence: 99%

Atomic-Resolution Imaging of Micron-Sized Samples Realized by High Magnetic Field Scanning Tunneling Microscopy

Wang

Zhang

et al. 2023

Micromachines

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Scanning tunneling microscopy (STM) can image material surfaces with atomic resolution, making it a useful tool in the areas of physics and materials. Many materials are synthesized at micron size, especially few-layer materials. Limited by their complex structure, very few STMs are capable of directly positioning and imaging a micron-sized sample with atomic resolution. Traditional STMs are designed to study the material behavior induced by temperature variation, while the physical properties induced by magnetic fields are rarely studied. In this paper, we present the design and construction of an atomic-resolution STM that can operate in a 9 T high magnetic field. More importantly, the homebuilt STM is capable of imaging micron-sized samples. The performance of the STM is demonstrated by high-quality atomic images obtained on a graphite surface, with low drift rates in the X–Y plane and Z direction. The atomic-resolution image obtained on a 32-μm graphite flake illustrates the new STM’s ability of positioning and imaging micron-sized samples. Finally, we present atomic resolution images at a magnetic field range from 0 T to 9 T. The above advantages make our STM a promising tool for investigating the quantum hall effect of micron-sized layered materials.

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30 T scanning tunnelling microscope in a hybrid magnet with essentially non-metallic design

Cited by 13 publications

References 26 publications

A compact, friction self-matching, non-inertial piezo motor with scanning capability

A compact, friction self-matching, non-inertial piezo motor with scanning capability

A Novel Atomically Resolved Scanning Tunneling Microscope Capable of Working in Cryogen-Free Superconducting Magnet

Atomic-Resolution Imaging of Micron-Sized Samples Realized by High Magnetic Field Scanning Tunneling Microscopy

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