Short-range magnetic order with spin density wave in chromium base multilayers

The mechanism for forming the short-range antiferromagnetic order with the spin density wave (SDW) near the interfaces in the Fe/Cr type multilayers is proposed. The main cause of the magnetic ordering with the SDW consists in the redistribution of the charge (and as the consequence - spin) density in the vicinity of the Fe/Cr interface, leading to the paramagnetic phase instability at the temperatures significantly exceeding the Neel temperature in the chromium. The heterogeneous collinear SDW structures are found within the frames of the Ginzburg-Landau expansion for the system free energy and the phase diagram is plotted (the transition temperature dependence on the antiferromagnetic interlayer thickness). The experimental data on the neutron scattering and tunnel microscopy are discussed on the basis of the obtained results