Ferromagnetic EuS films: Magnetic stability, electronic structure, and magnetic surface states

Abstract

We present the temperature and layer dependent electronic structure of a\n20-layer EuS(100)-film using a combination of first-principles and model\ncalculation, the latter based on the ferromagnetic Kondo-lattice. The\ncalculated thickness-dependent Curie temperature agrees very well with\nexperimental data. The projected 5d-bandstructure is at finite temperatures\nstrongly influenced by damping effects due to spin exchange processes.\nSpin-split unoccupied 5d-surfaces states are found with a Stoner-like\ncollapsing for increasing temperature towards the Curie point and with an\nexponential decay of spectral weight with increasing distance from the surface.\n