Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.63: Poster

Monday, March 26, 2007, 15:00–17:30, Poster A

GaMnAs on patterned GaAs(001) substrates: Growth and magnetotransport — •Joachim Daeubler, Michael Glunk, Thomas Hummel, Wladimir Schoch, Wolfgang Limmer, and Rolf Sauer — Institut für Halbleiterphysik, Universität Ulm, 89069 Ulm, Germany

A new type of GaMnAs microstructures with laterally confined electronic and magnetic properties has been realized in a bottom-up procedure by growing GaMnAs films on [110]-oriented ridge structures with (113)A sidewalls and (001) top layers prepared on GaAs(001) substrates [1]. Previous studies on planar GaMnAs samples have revealed different incorporation of Mn and excess As in (001) and (113)A layers [2]. Accordingly, temperature- and field-dependent magnetotransport measurements on the overgrown ridge structures clearly demonstrate the coexistence of electronic and magnetic properties specific for (001) and (113)A GaMnAs in one single sample. This introduces an additional degree of freedom in the development of new functional structures.

[1] W. Limmer, J. Daeubler, M. Glunk, T. Hummel, W. Schoch, and R. Sauer, Microelectron. J. 37, 1535 (2006).

[2] J. Daeubler, M. Glunck, W. Schoch, W. Limmer, R. Sauer, Appl. Phys. Lett. 88, 051904 (2006).