Journal
APPLIED PHYSICS LETTERS
Volume 76, Issue 20, Pages 2928-2930Publisher
AMER INST PHYSICS
DOI: 10.1063/1.126519
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We have studied the quasibinary ferromagnetic semiconductor (Ga0.98Mn0.02)As by magnetic circular dichroism in x-ray absorption. We find a richly structured Mn absorption spectrum typical for localized 3d electrons. An analysis of the magnetization-averaged and dichroism line shapes shows a local Mn moment of 4.6 mu(B), which is close to the Hund's rule moment for the half-filled 3d shell. The magnitude of the dichroism reveals that only about 1/7 of the Mn atoms participate in the ferromagnetic order. Our experiment does not show a distinction between the ferro- and paramagnetic Mn atoms. (C) 2000 American Institute of Physics. [S0003-6951(00)00720-8].
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