Abstract
Recent experimental data, showing a dimensional crossover of the T-dependent magnetization in MBE-grown Fe(110)/Ag(111) superlattices with different Ag spacer thickness, are theoretically reanalyzed, using a Heisenberg model of localized spins with intraplane and interplane exchange interactions and including easy-plane and easy-axis surface anisotropies. The latter ones are shown to play an important role in the stabilization of the long range order, more evident for large thickness of the Ag spacer. The spin-wave dispersion curves and the magnetization are calculated in the framework of a Green’s function method and the correct asymptotic forms for the temperature dependence of the spin deviation in the quasi-2D regime (T ln T) and in the 3D one (T3/2) are obtained.
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