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MA: Fachverband Magnetismus
MA 26: Exchange Bias
MA 26.4: Talk
Thursday, March 29, 2007, 16:00–16:15, H10
Néel Temperature Shifts Due to Magnetic Proximity Effects in Ni/FexMn1−x Bilayers — •K. Lenz, S. Zander, and W. Kuch — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
We present a study of the ordering temperature of an ultrathin antiferromagnetic film in the proximity of a ferromagnetic layer. Magneto-optical Kerr effect measurements have been used to monitor the Néel temperature of a single-crystalline antiferromagnetic FexMn1−x film on Cu(001) in contact to a ferromagnetic Ni layer. The Néel temperature was determined from the discontinuity in the coercivity as a function of temperature. This ordering temperature decreases by up to 60 K if the magnetization axis of the ferromagnet is switched from out-of-plane to in-plane by deposition of a Co overlayer. As the application of the Co overlayer does not alter the antiferromagnet/ferromagnet interface, these results give clear evidence for a magnetic proximity effect in which the coupling to the ferromagnetic layer substantially influences the ordering temperature of the antiferromagnetic layer.