Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Scanning Probe Techniques
O 37.11: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
Scanning Tunneling Microscope for 37T Magnetic Field — •Jan W. Gerritsen1, Suruchi Singh1,2, Wei Tao2, Bas L. M. Hendriksen1, Peter C. M. Christianen2, Ulrich Zeitler2, and Jan C. Maan2 — 1Institute for Molecules and Materials, Radboud University Nijmegen, Netherlands — 2High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University Nijmegen, Netherlands
We are adapting [1] and developing a scanning tunneling microscope (STM) that will work in magnetic fields up to 37T [2]. This unique instrument should enable us to image surfaces and nanostructures with very high resolution and to perform local electronic spectroscopy (STS) in hitherto unexploited magnetic field ranges. State-of-the-art STMs in superconducting magnets typically operate up to 15T. Our STM works inside the 32mm bore of a Bitter magnet with fields up to 37T and at liquid helium temperatures (1.4K). The challenge here is to develop an STM for these extreme environments. The 140l/sec cooling water for the magnet and 40kA current in the coil lead to a very bad acoustic and vibration environment for scanning probe microscopes. In our design, materials and vibration isolation for the STM head have been chosen to be compatible with these extreme conditions inside the magnet. I will show the design as well as the performance of the STM at high fields and low temperatures in topographic images and dI/dV spectroscopy experiments.
[1] J.G.A. Dubois et al., Rev. Sci. Instrum. 66, 4146 (1995)
[2] www.ru.nl/hfml/