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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.39: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Design of an UHV-STM with a Split Coil Magnet for Low Temperature Applications — •Mike Gyamfi, Oswald Pietzsch, Julian C. Chen, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg

To study the spin dependent local electronic structure of single magnetic nanowires and nanoislands a new STM will be installed in a three chamber ultra high vacuum system. The STM will be operated in a liquid helium bath cryostat (expected base temperature 6 K) with a split-coil-magnet which assures good access for sample and tip exchange. A magnetic field of 5 T in z-direction will be available. A new feature of the system is a mechanism which will enable the controlled rotation of the magnetic tunnelling tip. It will provide the unique opportunity to tune the azimuth angle of an in-plane magnetised tip to a collinear configuration with the sample magnetisation in order to maximise the magnetic contrast. A further feature is the possibility to rotate the sample about the x-axis. This will allow evaporation onto the cold substrate and immediate STM measurements without loss of the microscopic position on the sample. We will discuss the design concept of the system.