Abstract
Layered thin films consisting of rare earth materials and magnetic transition metals reveala variety of magnetic properties due to their complex coupling interactions. The Gd/Nisystem adds its own features due to the interplay of saturation moments and Curietemperatures of these two metals. Magnetic coupling in Gd/Ni bilayers leadsto negative remanence and interesting magnetic switching behavior, which isstrongly temperature-dependent. A transition from the ‘nickel-aligned’ state to the‘gadolinium-aligned’ state is observed at 45 K, independent of the chosen substrate andhence of the Curie point of the Gd layer, which depends on the substrate. In x-raymagnetic circular dichroism experiments a polarization of Gd moments at the interfaceantiparallel to the Ni layer was observed even at room temperature. Structural analysisshow a rough Gd/Ni interface with grains of a few nm and an amorphous Gd growth isindicated by diffraction methods.
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