Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 20: Amorphous Thin Magnetic Films
DS 20.3: Topical Talk
Mittwoch, 25. März 2009, 16:45–17:15, GER 37
Magnetism in FeZr-based multilayers – stability, coupling, dimensionality — •Andreas Liebig1, Panagiotis Korelis2, Gabriella Andersson2, Hans Lidbaum3, Klaus Leifer3, and Björgvin Hjörvarsson2 — 1Inst. of Physics, TU Chemnitz, Chemnitz, Germany — 2Dep. of Physics, Uppsala University, Uppsala, Sweden — 3Dep. of Engineering Sciences, Uppsala University, Uppsala, Sweden
We present a study on the magnetism of FeZr-based multilayers with either insulating or metallic interlayers, using MOKE and SQUID magnetometry. The structure was determined using X-ray reflectivity as well as HR-TEM and the chemical composition was determined by RBS.
A brief overview over the Fe91Zr9/Al2O3 system, where the interplay between dewetting and phase separation leads to the formation of nanocrystallites at the interface, will be given. For Fe90Zr10/Al70Zr30 multilayers, however, the formation of a nanocrystalline phase can be excluded from structural and magnetic measurements. Therefore, these can be used as a prototype to study magnetic coupling phenomena in amorphous systems in low dimensions. The interlayer exchange coupling over the Al70Zr30 turns out to be negligible, and the ordering temperature scales therefore only with the thickness of the magnetic layers. Above the apparent ordering temperature a phase with exceedingly high magnetic susceptibility is found. Similarities to the hypothetic Aharony-Pytte phase of infinite magnetic susceptibility are discussed, and a conceptual model for the transition is given.