Element resolved spin configuration in ferromagnetic manganese-doped gallium arsenide.
We report induced Ga and As moments in ferromagnetic Ga(1-x)MnxAs detected using x-ray magnetic circular dichroism at the Mn, Ga, and As L(3,2) edges. Across a broad composition range, we find As and Ga dichroism signals which indicate an As 4s moment coupled antiparallel to the Mn 3d moment, and a smaller parallel Ga 4s moment. The Ga moment follows that of Mn in both doping and temperature dependence. These results are consistent with recent predictions of induced GaAs host moments and support the model of carrier-mediated ferromagnetic ordering involving As-derived valence band states.
Keavney
D J
DJ
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
Wu
D
D
Freeland
J W
JW
Johnston-Halperin
E
E
Awschalom
D D
DD
Shi
J
J