Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.10: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

STM investigation of MBE-grown GaMnAs — •Henning Gutzmann, Andrea Stemmann, Florian Adler, Jens Wiebe, Felix Marczinowski, Christian Heyn, Wolfgang Hansen, and Roland Wiesendanger — Hamburg University, Institute of Applied Physics, Jungiusstr. 9-11, D-20355 Hamburg, Germany

The detailed understanding of the hole mediated magnetic coupling in Mn doped III-V semiconductors is an important step towards room temperature ferromagnetism in semiconductors. Scanning tunneling spectroscopy (STS) has already been used to detect the exchange interaction between Mn acceptors in GaAs [1]. We want to extend this method and directly image the magnetization of Mn in GaAs using spin-polarized STS at low temperatures [2]. The (001) oriented samples are grown in the Hamburg molecular beam epitaxy (MBE) facility. We built a mobile ultra-high-vacuum (UHV) transfer-system which is used to transfer the samples from the MBE into our scanning tunneling microscope (STM) facility [3]. We present the concept of the UHV-transfer system and show first STM measurements at room temperature.

[1] D. Kitchen et al., Nature 442, 426 (2006)

[2] A. Wachowiak et al., Science 298, 577 (2002)

[3] J. Wiebe et al., Rev. Sci. Instrum. 75, 4871 (2004)