Abstract
Using many-body Green function theory for thin ferromagnetic Heisenberg films, wecompare the static susceptibilities (transverse and parallel) calculated for uniaxialsingle-ion anisotropy and exchange anisotropy, respectively. Although there are qualitativedifferences in the results of these calculations with respect to the temperature dependenceof the easy and hard axis magnetizations and susceptibilities, the calculated values of theseobservables are quantitatively so similar that it is unlikely that experimental measurementscould decide on which type of anisotropy is acting in a real ferromagnetic film.
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