Determination of the magnetic fluctuations in an Fe/Cr/Fe trilayer exhibiting a neutron resonance state

We show a measurement of off-specular polarized neutron scattering from an Fe/Cr/Fe trilayer inside which a second-order neutron resonance has been excited, i.e. where the probability to find a neutron was maximum at both Fe/Cr interfaces. Simulating the data in the framework of the Distorted Wave Born Approximation showed the presence of structural and magnetic fluctuations. Magnetic fluctuations in the vicinity of the Fe/Cr interfaces can be explained if one considers the anti-ferromagnetic structure of Cr and structural roughness. [Copyright &y& Elsevier]