Fe/Mn/Fe wedged-shape sandwiches were prepared by molecular beam epitaxy un
der optimal conditions. The interlayer coupling measured by magneto-optic K
err effect is very strong for thin Mn layers. The canted angle between the
magnetization vectors of the two magnetic layers in remanence increases gra
dually from 0 degrees to about 180 degrees and then gradually reduces to 90
degrees for Mn thicknesses from 0.62 to 1.2 nm. For Mn layer thicknesses i
n the range between 1.2 and 2.45 nm, the interlayer coupling is always 90 d
egrees coupling, but its strength oscillates with a short period of about 2
Mn monolayers. The above coupling phenomenon can be well described by the
proximity magnetism model. [S0163-1829(99)50618-8].