THE OBSERVATION OF A 3-D TO 2-D CROSSOVER IN THE MAGNETISM OF EPITAXIAL FE(110)/AG(111) MULTILAYERS

[摘要] Transmission Fe-57 Mossbauer spectroscopy (TMS) was used to determine the temperature dependence of the magnetization of a series of Fe(110)/Ag(111) multilayer films grown by molecular beam epitaxy (MBE). The multilayer series of films had 3 monolayer (ML) thick Fe(110) bilayer components, and Ag(111) bilayer component thicknesses equal to 4, 8, 12 and 20 ML. The TMS spectra of each of these films consisted of a single magnetically-split sextet, with no additional superparamagnetic central features apparent. The multilayer withthe 4 ML Ag bilayer component exhibited a T3/2 hyperfine field temperature dependence. However, a transitional crossover in the Mossbauer hyperfine field temperature dependence with mixed T3/2 and linear behavior was observed for the multilayers with intermediate Ag bilayer component thickness, while the 20 ML Ag bilayer component multilayer exhibited a linear hyperfine field temperature dependence. In the light of the absence of significant superparamagnetism in these films, the linear hyperfine field temperature dependence in the thickest Ag bilayer component multilayer is most likely the result of a genuine quasi-two-dimensional behavior.

[发布日期] 1991-02-01

[效力级别]  Proceedings Paper