Abstract
By employing retarded Green functions, the spin-wave spectrum andthe layer-sublattice magnetization in Heisenberg ferrimagneticthree-layer superlattices and three-layer systems are calculatedwithin the framework of the linear spin-wave approximation. Theeffects of the interlayer exchange constants and the intralayerexchange constants on the magnetic properties of the two systems arecompared with those for the corresponding three-sublattice bulkferrimagnets. It is found that all the differences between themagnetic properties of these systems originate from the differencesbetween the exchange couplings in the three dimensions of thesystems. The quantum correlations, such as the competition,cancellation, and transmission of the effects of the exchangecouplings, are important for the magnetic properties of the systems.The asymmetry of the systems plays an important role in thezero-point quantum fluctuations and, correspondingly, in thelayer-sublattice magnetizations of the layers.
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