We investigated light-emitting diodes consisting of an InGaAs/GaAs quantum well adjacent to a ferromagnetic dhMni-layer. The magnetic field-dependent circular polarization obtained from both photo-and electroluminescence shows an unusual sign inversion depending on the growth parameters that can be explained by an interplay of the Zeeman splitting and Mn-hole interaction effects. Our results can help to understand the origin and control of the spin polarization on Mn doped GaAs structures, a fundamental step for the development of Mn-based spintronic devices.
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