Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 63: III-V Semiconductors
HL 63.9: Talk
Friday, March 26, 2010, 12:30–12:45, H13
Identification of the character of ferromagnetic Mn in Epitaxial Fe/GaMnAs heterostructures by XMCD and XRMS measurements — •Marcello Soda1, Francesco Maccherozzi2, Matthias Sperl1, Dieter Schuh1, Günther Bayreuther1, Werner Wegscheider1,4, Giancarlo Panaccione3, and Christian Back1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Deutschland — 2Soleil Synchrotron, L'Orme des Merisiers Saint-Aubin, BP 48, F- 91192 Gif-sur-Yvette , France — 3Laboratorio Nazionale TASC, INFM-CNR, in Area Science Park, S.S. 14, Km 163.5, I-34012, Trieste, Italy — 4Laboratorium für Festkörperphysik, Schafmattstr. 16, 8093 Zürich, Switzerland
We demonstrate that the growth of Fe/(Ga,Mn)As heterointerfaces can be efficiently controlled by epitaxy, and that robust ferromagnetism of the interfacial Mn atoms is induced at room temperature by the proximity effect. X-ray magnetic circular dichroism and X-ray resonant reflectivity data, supported by theoretical calculations, were used to monitor both the temperature and the magnetic field dependence of the Mn magnetic moment in the semiconducting host. We identify distinct Mn populations, each of them with specific magnetic character.