Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.56: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Interlayer exchange coupling of magnetic rare-earth thin films — •J.E. Prieto, K. Döbrich, O. Krupin, F. Heigl, G. Kaindl, and K. Starke — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin
Exchange coupling between magnetic layers determines the properties of magnetic heterostructures. Magnetic moments in rare-earth metals are strongly localized and couple only indirectly through the conduction electrons. In the case of magnetic films separated by nonmagnetic spacer layers, the thickness and electronic structure of the latter determine the sign and magnitude of the coupling. We have studied epitaxial Gd/Y/Tb trilayers on W(110) element-specifically by means of x-ray magnetooptical Kerr effect (XMOKE) performed at the M4,5 absorption thresholds of Gd and Tb. The two magnetic rare-earth films have different coercivities. For applied magnetic fields smaller than the Tb coercivity, shifted Gd hysteresis curves are observed. A strong dependence of this exchange bias on the thickness of the Y spacer layer as well as on the temperature is found.