Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.44: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Development of a low-temperature scanning tunneling microscope for spin-polarized measurements in high magnetic fields — •Oliver Storz, Paolo Sessi, and Matthias Bode — Institute of Experimental Physics II, University Würzburg, Am Hubland, 97074 Würzburg

The discovery and characterization of new phenomena in surface science calls for advanced experimental techniques which combine ultra-high spatial and energy resolution with extreme environments. Here we present a new Scanning Tunneling Microscope (STM) designed for spin-polarized measurements at low temperatures and in high magnetic fields. Cooling is achieved by pressing the STM head against a pumped liquid He bath with a base temperature T ≤ 1.2 K. A superconducting magnet supplies a vertical field up to 12.5 T. The microscope design and the materials used have been optimized to achieve high resonance frequencies, resulting in an excellent stability of the instrument. A piezo-driven x,y-sample stage allows for a lateral travel range of ± 2 mm. By means of a linear transfer system the STM head can be moved between the measurement position inside the cryostat and a position for tip and sample exchange as well as for in-situ deposition onto the cold sample surface.