Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnetic Coupling Phenomena / Exchange Bias
MA 8.6: Vortrag
Montag, 23. März 2009, 16:30–16:45, HSZ 401
Thickness Dependence of the Antiferromagnetic Ordering Temperature in Ni/FexMn1−x Bilayers — •Miriam Stampe, Tobias Homberg, and Wolfgang Kuch — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
The ordering temperature of ultrathin single-crystalline antiferromagnetic (AFM) FexMn1−x layers is influenced by magnetic proximity effects due to a ferromagnetic overlayer. We have determined this ordering temperature TAFM from the polar magneto-optical Kerr effect response of out-of-plane magnetized Ni overlayers (15 ML). Systematic investigations on the influence of the AFM layer thickness (6-10 ML) and composition (0.4<x<0.6) in these Ni/FexMn1−x/Cu(001) bilayers on TAFM were performed. The ordering temperature is determined from the discontinuity in the temperature dependence of the coercive field. With increasing thickness, the ordering temperature rises, while the influence of the FexMn1−x composition is much smaller than in Co/FexMn1−x/Cu(001) bilayers [1].
[1] F. Offi et al., Phys. Rev. B 66, 064419 (2002)
Financial support by the DFG (KU1115/7-2) is acknowledged.