Design and performance of an ultra-high vacuum spin-polarized scanning tunneling microscope operating at 30 mK and in a vector magnetic field
| Autor: | Alexander A. Khajetoorians, Daniel Wegner, Jan Hermenau, Jan W. Gerritsen, Andreas Eich, A. Sonntag, Henning von Allwörden, Elze J. Knol |
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| Rok vydání: | 2018 |
| Předmět: |
Microscope
Ultra-high vacuum FOS: Physical sciences 02 engineering and technology 01 natural sciences law.invention law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Dilution refrigerator 010306 general physics Instrumentation Superconductivity Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Magnetic structure business.industry Scanning Probe Microscopy Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Magnetic field Magnet Optoelectronics Scanning tunneling microscope 0210 nano-technology business |
| Zdroj: | Review of Scientific Instruments, 89, 3, pp. 1-10 Review of Scientific Instruments, 89, 1-10 |
| ISSN: | 0034-6748 |
| Popis: | We describe the design and performance of a scanning tunneling microscope (STM) which operates at a base temperature of 30 mK in a vector magnetic field. The cryogenics is based on an ultra-high vacuum (UHV) top-loading wet dilution refrigerator that contains a vector magnet allowing for fields up to 9 T perpendicular and 4 T parallel to the sample. The STM is placed in a multi-chamber UHV system, which allows in-situ preparation and exchange of samples and tips. The entire system rests on a 150-ton concrete block suspended by pneumatic isolators, which is housed in an acoustically isolated and electromagnetically shielded laboratory optimized for extremely low noise scanning probe measurements. We demonstrate the overall performance by illustrating atomic resolution and quasiparticle interference imaging and detail the vibrational noise of both the laboratory and microscope. We also determine the electron temperature via measurement of the superconducting gap of Re(0001) and illustrate magnetic field-dependent measurements of the spin excitations of individual Fe atoms on Pt(111). Finally, we demonstrate spin resolution by imaging the magnetic structure of the Fe double layer on W(110). |
| Databáze: | OpenAIRE |
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