Abstract
Parallel susceptibility of the quantum Blume{Capel model for ferromagnetic fllms is calculated within the Green function theory. The Hamiltonian includes a Heisenberg term with the difierent surface exchange coupling with respect to bulk, an external magnetic fleld, a second-order uniaxial single-ion anisotropy, and the exchange anisotropy. The importance of collective excitations is demonstrated by comparing with result calculated within mean fleld approximation.
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