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/Fe_xMn_1−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) Fe_xMn_1−x layers is influenced by magnetic proximity effects due to a ferromagnetic overlayer. We have determined this ordering temperature T_AFM 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/Fe_xMn_1−x/Cu(001) bilayers on T_AFM 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 Fe_xMn_1−x composition is much smaller than in Co/Fe_xMn_1−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.