The spatial extent ζAFM and strength JAFM of the antiferromagnetic (AFM) exchange coupling at buried Gd $/$Fe interfaces in ferrimagnetic [Gd(50)Fe(15,350ex0ex)]₁₅ sputtered multilayers is obtained from combined x-ray resonance magnetic reflectivity and magnetic circular dichroism measurements. ζAFM is 4.1(7)0ex0ex or ~1--2 interatomic distances in bulk Gd and Fe; JAFM is 1050(90) K, comparable to the ferromagnetic exchange in bulk Fe.
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Haskel et al. (2001) studied this question.