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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.58: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Reversal of interlayer coupling with temperature — •M. Wietstruk, K.M. Döbrich, J.E. Prieto, O. Krupin, F. Heigl, G. Kaindl, and K. Starke — Freie Universität Berlin, Fachbereich Physik

The oscillatory nature of interlayer coupling has been analyzed for the case of Gd/Y/Tb trilayers. This epitaxial all-rare-earth system differs from the well known transition metal systems as both the interlayer and the intralayer coupling are of the indirect RKKY type, and hence of similar strength. We used x-ray magneto-optical Kerr effect (XMOKE) at the 3d-4f excitation thresholds to record element specific hysteresis loops of Gd and Tb for different Y spacer thicknesses up to 2 nm. For a constant spacer thickness, the interlayer coupling is found to change with temperature between antiferromagnetic and ferromagnetic. This up to now unobserved effect shows a systematic behavior with spacer thickness; it will be discussed in light of a simple model for interlayer exchange coupling.