Structural and Magnetic Ordering of Chromium in Ag / Cr Multilayers
We studied the influence of the lattice structure on the chromium magnetism in $\mathrm{Ag}/\mathrm{Cr}$ multilayers by combining structural characterization techniques and perturbed angular correlation spectroscopy. Chromium in $\mathrm{Ag}/\mathrm{Cr}$ multilayers orders as an incommensurate longitudinal spin-density wave (SDW) with the spins oriented out of plane. A size effect induces the instability of the SDW below a critical chromium thickness. The absence of the spin-flip transition, the position of the N\'eel temperature, and the actual character of the SDW are attributed to the specific structural properties.