TEMPERATURE-DEPENDENCE OF LOCAL MAGNETIZATION IN TRANSITION-METAL ULTRATHIN FILMS

An analysis of the results obtained for the temperature dependence of the local magnetization in experimental and theoretical approaches is presented. Experimental data are obtained for Fe(110)/W ultrathin film s with use of conversion electron Mossbauer spectroscopy. The calculat ions are performed for Ni films within the framework of the itinerant electron model. Both experimental and theoretical results show that th ere is a temperature region in which the magnetization decreases accor ding to the Bloch law. The Bloch coefficient B corresponding to the te mperature dependence of the average film magnetization increases with a decrease of film thickness t. A linear dependence of B on t-1 is obt ained in both systems. Moreover, a similar spatial distribution of the local magnetization is found in experimental and theoretical approach es.