J. Kohlhepp et al., MIMICKING OF A STRONG BIQUADRATIC INTERLAYER EXCHANGE COUPLING IN FE SI MULTILAYERS/, Physical review. B, Condensed matter, 55(2), 1997, pp. 696-699
The antiferromagnetic interlayer exchange coupling properties of sputt
ered Fe/Si multilayers have been studied by magnetometry and spin-pola
rized neutron reflectometry. Both the degree of antiferromagnetic alig
nment of adjacent ferromagnetic layers at zero field and the strength
of the coupling are found to depend on the position in the multilayer
stack. It is shown that these interlayer coupling variations are able
to imitate an apparent strong biquadratic coupling.