Maccherozzi, F. and Panaccione, G. and Rossi, G. and Hochstrasser, M. and Sperl, Matthias and Reinwald, Matthias and Woltersdorf, Georg and Wegscheider, Werner and Back, Christian H.
Influence of surface treatment on the magnetic properties of GaxMn1−xAs thin films.
Physical Review B (PRB) 74 (10), pp. 104421-635.
We present a surface science study on carefully characterized GaxMn1−xAs films grown on GaAs(100), where we investigate the influence on magnetic properties of different surface cleaning procedures. X-ray magnetic circular dichroism reveals a net remnant magnetization along the (100) axis, after chemical etching is performed. The analysis of Mn L2,3 XAS line shapes in different environment indicates that Mn in GaxMn1−xAs behaves as a bulk impurity. By exploiting the different depth sensitivity between x-ray photoemission and x-ray absorption we observe the presence of a Mn depleted layer at the surface after etching.