Evolution of the magnetic and electronic properties of ultrathin Cr(001) films

We present a spin resolved inverse photoemission study of Cr ultrathin films (up to few monolayers [ML]) grown on Ag(001) and Fe(001) at room temperature. The magnetic properties of the films are strongly influenced by the different interaction with the substrates. For the Cr/Ag(001) system, where the chemical interaction of the overlayer with the substrate is very small, no polarization dependence of the Cr features is observed, a finding which can fit within the predicted antiferromagnetism of a Cr layer. For the case of Cr/Fe(001), the Cr contribution is strongly polarized in the early stages of the interface formation (up to 2 ML) and then becomes gradually unpolarized.