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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.1: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Design of an XSTM head for low temperature high magnetic field studies of III-V heterostructures — •Bruno Chilian, Jens Wiebe, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Germany

With the ultimate goal of future spintronic applications, dilute magnetic semiconductors like Mn doped GaAs have been heavily studied because of the possibility to tune their magnetic properties and thereby control the charge carrier's spin degree of freedom. However, a detailed understanding of how the local moments of magnetic impurities couple has yet to be achieved.

One technique which combines the power of atomic scale characterization with the ability to probe deeply buried impurities in MBE grown samples is cross sectional scanning tunneling microscopy (XSTM). However, few instruments have demonstrated the ability to provide atomic scale spectroscopic capability of such systems with high energy resolution. Here, we describe a homebuilt STM head which can be utilized in UHV conditions in a 300mK 14T environment.

To be able to locate the MBE grown layer of interest on the cleaved wafer surface, our STM head is capable of coarse XY sample movement. Its small diameter fits into the narrow bore of the 14 T superconducting magnet in our 300 mK facility. While constituting one of the main design challenges, the compact build simultaneously ensures mechanical stability, thereby promoting low noise levels.