Abstract
Very recently, new techniques in the magneto-optical recording were proposed which promise the readout of domains smaller than the optical diffraction limit. For this purpose Gd–(Fe,Co) alloy films are used, which change their magnetization direction with temperature. In this experimental study for the first time spin reorientation effects in multilayers of Gd/(FeCo) and Gd/Fe were investigated with varying composition and periodicity. Both Gd/(FeCo) and Gd/Fe films show a compositional dependence of the anisotropy similar to a phase transition. An in-plane to perpendicular spin reorientation near the compensation temperature Tcomp can be obtained in rare earth rich films for small periodicities λ∼1.1 nm, but for increasing λ the anisotropy change occurs at temperatures different from Tcomp. The opposite effect, i.e., spin reorientation from perpendicular to in-plane, can be observed in transition metal rich Gd/(FeCo) multilayers but not in Gd/Fe multilayers. The anisotropy behavior and the reorientation effects are explained qualitatively within a new model.
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