Abstract
We present the magnetic properties of δ-MnGa/(Mn,Ga,As)/δ-MnGa trilayers. The spacer layer consists of nominally 2 to 19 monolayers (ML) GaAs, but we have indications for an important incorporation of Mn and the possible formation of antiferromagnetic Mn 2As. Antiferromagnetic (AFM) coupling is observed for spacer layer thicknesses of 4 to 14 ML GaAs, ferromagnetic (FM) coupling exists outside this region. The largest observed coupling field was −87.0 mT (−870 Oe) at 17 K for a sample with a 12 ML spacer layer, causing a cross-over between both branches of the hysteresis loop and a negative remanence. In one sample (16 ML) the coupling changes from AFM at low temperature to FM at room temperature.
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