  The design of spin-transport based devices such as magnon transistors or spin
valves will require multilayer systems composed of different magnetic materials
with different physical properties. Such layered structures can show various
interface effects, one class of which being proximity effects, where a certain
physical phenomenon that occurs in the one layers leaks into another one. In
this work a magnetic proximity effect is studied in trilayers of different
ferro- and antiferromagnetic materials within an atomistic spin model. We find
the magnetic order in the central layer - with lower critical temperature -
enhanced, even for the case of an antiferromagnet surrounded by ferromagnets.
We further characterize this proximity effect via the magnon spectra which are
specifically altered, especially for the case of the antiferromagnet in the
central layer.
