Abstract

We provide evidence for the existence of an antiferromagnetic coupling betweeniron epilayers separated by a wedge-like ZnSe crystalline semiconductor bymagnetometric and ferromagnetic resonance experiments. The coupling strength of46 µJ m−2 for tZnSe = 25 Å is strongly reduced as the barrier thickness is increased. Thecoupling increases linearly with temperature from 5 to 300 K, with a5.5 × 10−9 J m−2 K−1 rate. Thermally induced effective exchange coupling mediated by spin-dependent tunnellingof electrons via localized mid-gap defect states in the ZnSe spacer layer appearsto be the most plausible mechanism to induce the antiferromagnetic coupling.

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