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Article

Resonant indirect exchange via spatially separated two-dimensional channel

Applied Physics Letters. 2015. Vol. 106. No. 25. P. 252402-1-252402-5.
K.I. Kugel, Rozhansky I. V., Krainov I. V., Averkiev N. S., Aronzon, B., Tripathi V., Lähderanta E.
We apply the resonant indirect exchange interaction theory to explain the ferromagnetic properties of the hybrid heterostructure consisting of a InGaAs-based quantum well (QW) sandwiched between GaAs barriers with spatially separated Mn delta-layer. The experimentally obtained dependence of the Curie temperature on the QW depth exhibits a peak related to the region of resonant indirect exchange. We suggest the theoretical explanation and a fit to this dependence as a result of the two contributions to ferromagnetism—the intralayer contribution and the resonant exchange contribution provided by the QW.