Magnetic Studies of Spin Wave in Fe/Ag Multilayer Films

Magnetic properties of Fe/Ag multilayer films are investigated and examined versus Fe layer thickness t (Fe). As a result, spontaneous magnetization M(T) temperature dependence has been revealed to be well described by a T (3/2) law in all multilayer films (7 a parts per thousand currency signt (Fe)a parts per thousand currency sign60 ). Spin-wave theory based on anisotropic ferromagnetic system has been also used to explain magnetization temperature dependence. For Fe layer thickness, approximate values for J (0) bulk exchange interaction and J (s) surface exchange interaction have been estimated. First principle calculations based on density functional theory (DFT) and Korringa-Kohn-Rostoker (KKR)-coherent potential approximation (CPA) method-combined with Local Spin Density Approximation (LSDA), are performed as well. Magnetic moment, in fcc Ag(1-x) Fe (x) and bcc Fe(1-x) Ag (x) systems, versus x is presented and discussed in terms of Fe content on magnetic coupling. Reasonable agreement between experimental data and theoretical calculations is highlighted.