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Exchange coupling between two magnetic layers through an interlayer is ofbroad interest for numerous recent applications of nano-magnetic systems. Inthis Letter we study ferromagnetic exchange coupling through amorphousparamagnetic Fe-Ta alloys. We show that the exchange coupling dependsexponentially on spacer thickness and scales with the Fe-Ta susceptibility,which can be tuned via the alloy composition and/or temperature. Such materialsare of high interest for the engineering of perpendicularly magnetizedCoFeB-MgO based tunnel junctions as it enables ferromagnetic coupling ofmagnetic layers with differing crystalline lattices, suppresses dead layers andcan act as an inter-diffusion barrier during annealing.

Paramagnetic Fe_xTa_{1-x} alloys for engineering of perpendicularly magnetized tunnel junctions