A paramagnet is used to probe directly the exchange coupling emanating
from a ferromagnetic specimen across a nonmagnetic spacer material by
measuring the induced magnetic moment. The model structure to observe
the oscillatory exchange field consists of a Cu(100) single crystal,
a Co base layer, a Cu spacer, and fee Fe as the paramagnetic probe lay
er with large magnetic susceptibility. Spin-resolving techniques show
that the magnetization of the paramagnet oscillates as a function of t
he thickness of the spacer as well as of the paramagnet.