2017/12/31 by Henning von Allwörden, Andreas Eich, Elze J. Knol +5 · 37 citations
Physics and Astronomy · #Cryogenics #Cryostat #Dilution refrigerator #Magnet #Magnetic field #Magnetic properties of thin films #Magnetometer #Noise (video) #Quantum and electron transport phenomena #Scanning electron microscope #Scanning tunneling microscope #Superconducting magnet #Surface and Thin Film Phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.5020045
published in Review of Scientific Instruments 89(3), 033902 (American Institute of Physics)
arxiv created 2018/02/05 · openalex created_date 2018/02/23 · openalex publication_date 2018/03/01 · arxiv updated 2018/03/13 · openalex updated_date 2026/08/05
We describe the design and performance of a scanning tunneling microscope (STM) that 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).