Scanning Tunneling Microscope is a device to scan conductive sample surfaces at the atomic scale. Quantum tunneling leads the STM theory. Conductive tip reaches to the conductive sample surface with a bias Voltage, and electrons can be tunneled between the sample and tip. As a result of this, tunnel current is occurred.
The ezSTM is a compact Scanning Tunneling Microscope System which provides excellent performance through all of these steps above. Besides its high performance, it is remarkably affordable as well. ezSTM is ideal for student laboratories, high schools, nanotechnology educations and basic researches with its compact, high stability and user-friendly design. ezSTM can be setup in 5 minutes, and after installation you are ready to explore atoms in minutes with ezSTM. Atomic resolution is obtained by ezSTM with high performance.
All ezSTM components which is controller, ezSTM scanner head, vibration isolation apparatus and laptop are included inside of the small suitcase. From the beginning, power cable, 2 USB cables and head cable are plugged and the user-friendly software is opened to start measurements. All of the software installation process are made by the ezSTM-Application Scientists of Nanomagnetics Instruments. After installation, you are ready to take measurements at an atomic resolution with the easy use of software interface.
The flexible design of the ezSTM allows to replace/move the scan head easily, and it provides easy usage for customers with the small footprint by an ultimate performance. Because the ezSTM takes a small space, and does not heavy, it can be transport easily.
Pt/Ir wire which is more simple and harmless than tip etching by dangerous chemicals is cut as a tip for scanning, and tip replacement is very simple which makes the ezSTM user-friendly. NanoMagnetics Instruments provides Pt/Ir wire in the ezSTM system User Kit for the customers.
Side view camera is located on the ezSTM scanner head, and it is useful to observe the sample, tip and the movement. The movement is done by ultrasonic motors. Also, maximum scan area of the ezSTM is 1x1x0.5 um. After all steps, you will be able to scan at the atomic resolution for your samples.
Current Range 1 pA-10 nA 100 pA-100 nA
Current Step Size 0.1 pA 0.1 Pa
Scan Range 0.5×0.5×0.2 µm 1x1x0.5 µm
XY Resolution 1 pm 1 pm
Z Resolution 0.5 pm 0.5 pm
Imaging Modes Constant current, constant height Constant current, constant height
Spectroscopy Current-Voltage Current-Distance
Tip Voltage ±15V in 300 µV steps ±15V in 300 µV steps
Sample Approach Ultrasonic motors Ultrasonic motors
XY coarse sample positioning Up to 5 mm Up to 5 mm
Sample Thickness Up to 15 mm Up to 15 mm
Side View Video Camera 2 MP CMOS, LED iluminated 2 MP CMOS, LED iluminated
Camera Focus and Zoom Manual Focus and 5X Digital Zooming Manual Focus and 5X Digital Zooming
Controller 24 Bit ADCs/DACs 24 Bit ADCs/DACs
Digital Feedback FPGA/DSP FPGA/DSP
Imaging Processing Simultaneous scan of 6 channels @ 4096×4096 pixels Simultaneous scan of 6 channels @ 4096×4096 pixels
Connection USB interface
Power Requirements 100-240, 50/60 Hz, 50 W 100-240, 50/60 Hz, 50 W
User License Unlimited
1. Is it necessary to fix the tip?
Yes, tip must be fixed, and the ezSTM is designed for proper tip fixing.
2. Is the tip conductive to scan by ezSTM?
Yes, tip is conductive, and Pt/Ir wire should be mounted.
3. What is the maximum scan range of the ezSTM?
Maximum scan range is 1x1x0.5 µm for ezSTM.
4. Is Vbias calibration made by customers before they use the ezSTM?
No, Vbias calibration is made by the engineers of NanoMagnetics Instruments before the system is shipped.
5. Can atomic resolution be obtained by ezSTM?
Yes. Atomic resolution can be obtained in the proper environment conditions. You can measure the atomic resolution for HOPG sample.
6. How can you prepare the tip for scanning?
Two methods can be done for the ezSTM measurements. Firstly, Pt/Ir wire is cut with 45° angle by wire cutter and the tip should be pretty sharper. Secondly, Tungsten is etched by NaOH – KOH. We use the first method for the ezSTM to prepare the tip.
7. What is the range of bias Voltage?
Range of bias Voltage is ± 15 Volt for the ezSTM measurements.
8. Which samples can be scanned?
Conductive samples can be scanned. Samples should be immobilized to the sample holder by silver paint to provide the conductivity.