Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.120: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
A low-temperature facility for spin-polarized scanning tunneling microscopy — •Lihui Zhou, Peter Löptien, Focko Meier, Jens Wiebe, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Germany
Spin-polarized scanning tunneling microscopy (SP-STM) is a well-established technique to give insights into magnetic properties [1]. To investigate atomic-scale magnetism of atomic-size nanostructures where the typical energy scale is on the order of sub-meV [2] a facility being able to conduct measurements at a temperature in the range of one Kelvin is a prerequisite. We have planned and constructed a low-temperature facility capable of SP-STM measurements. The commercial main chamber (SPECS, Berlin) contains a scanning tunneling microscope cooled by a Joule-Thomson cryostat resulting in a base temperature of 1.2 K using 4He.
The microscope integrates a lateral positioning stage enabling to perform cross-sectional STM investigations. This chamber also includes evaporators directing to the microscope’s sample receptacle enabling to deposit single atoms onto cold surfaces. There are two additional home-built vacuum chambers for in situ magnetic sample and spin-polarized tip preparation. These chambers contain evaporators, a sample heating manipulator, an e-beam heater, and a sputter gun. We will present measurements demonstrating both the spatial and the energy resolutions, and SP-STM measurements of the Fe double layer on W(110).
R. Wiesendanger, Rev. Mod. Phys. 81, 1495 (2009)
J. Wiebe et al., J. Phys. D: Appl. Phys. 44, 464009 (2011)